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Yup, I'm planning on using external controllers. I actually pulled the trigger on This (Geek Pi 7in Display) because I already had Amazon credit and should work well but I definitely will post when I'm done!. Thank you for the luck!

No, that screen will not work directly with any Raspberry Pi. The ribbon cable you see is a 50pin LVDS cable, which would plug into an LCD controller board that provides HDMI out and usually requires 12V power adapter. That would cost you $26.99, around $25 for the controller board, and around $10 for a 12V AC adaptor. At $62 total (without tax or shipping) you might as well spend $80 and get the official 7" Raspberry Pi touchscreen, which connects using the DSI connector, directly to the Raspberry Pi, requires no external power (unless you have power-hungry USB peripherals plugged into the Pi), and works right out of the box without drivers.

Given your example display measures 7", what size are you looking for? Would a 3.5"-4" display be acceptable for your project? If so I have recommendations below depending on your resolution and display speed needs. All of those displays connect via GPIO pins and sit directly on top of the Pi, making case fit very easy. No external power is required and there are some (very easy) drivers to install. However, if you are looking to play emulated games you probably won't be satisfied with the "standard" speed displays.

If you need a high resolution display for actual GUI desktop use I suggest either an an iUniker 3.6" or a HyperPixel 4" display. They are both high resolution (800x480) and high speed displays and work great. I have both and would recommend the iUniker model due to the lower cost, and it looks super crisp at 3.6". Keep in mind the iUniker model is ONLY for Pi 2/3B/3B+ and will not work with the new 4B; they offer a 480x320 version that does work with the 4B, but no 800x480 version yet. I'm not sure whether the HyperPixel works with the new 4B or not.

My recommendation: purchase the iUniker 3.6" 800x480 screen for $30 no matter what your intended use for it.

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Standard speed/low resolution displays:

• $25 - Kuman 3.5" resistive touchscreen (480x320): https://amazon.com/kuman-Raspberry-Screen-Display-Touch/dp/B07P7TLLRN
  
• $30 - Waveshare 3.5" IPS (much better viewing angles) resistive touchscreen (480x320): https://www.amazon.com/waveshare-3-5inch-RPi-LCD-Directly-pluggable/dp/B01N48NOXI
  
  High-speed/low resolution displays:
  
  
• $45 - Adafruit 3.5" PiTFT resistive touchscreen (480x320): https://www.adafruit.com/product/2441
  
  High-speed/high resolution displays:
  
  
• $30 - iUniker 3.6" IPS capacitive touchscreen (800x480): https://amazon.com/gp/product/B07JZHLWGM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
  
• $50 - Hyperpixel 4" IPS capacitive touchscreen (800x480): https://www.adafruit.com/product/3578

No.

>In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); with USB 3.0, it moves up to 900mA (0.9A).


screen: 12v x 1a = 12watts

usb 1-2: 5v x 0.5a = 2.5watts

usb 3: 5v x 0.9a = 4.5watts


under the best scenario (no loss at all during conversion) you are still 7.5watts short.

You would be better off using something like a laptop psu a couple buck converters to drop the voltage down to the 12v and 5v you need.

So the 10 digit bit should be fine, I would create and enclosure for the pi in the end of the box, you will need a number pad, carve an insert out of the wooden box

Numberpad:
https://www.amazon.co.uk/dp/B01H4PW8PS/ref=cm_sw_r_cp_apa_i_RAWzCbJ5DPQ1C

LED Display:
https://www.amazon.co.uk/dp/B06XJ9ZX17/ref=cm_sw_r_cp_apa_i_hCWzCb6D4W1JP

Smart Lock:

https://youtu.be/TX_WQMYc0SU

Python Script:

This will interface with GPIO and will contain a string with the access key, you read the input from the keyboard, output the entry on the LED display and finally check if user entry matches variable

I bought this kit last week

It has a lot of extras you may or may not need, plus a nifty miniature toolbox for compact storage.

It's not the best quality tool/set ever (and most of the products have chinese on them), but the old saying is buy the cheaper decent tool until you either use it till broken your you're too good for it, then upgrade.

I'm very happy with this kit. (I made something with it), so I know it actually works.

Again, do you want a HUD like Google Glass, or you just want to have something similar to a VR headset?

The glasses you linked are very similar to a VR headset. Once you put them on, you won't be able to see the outside world. With that in mind, here are two suggestions.

Vufine Wearable Display https://www.amazon.com/dp/B01MZ89QXF/ref=cm_sw_r_cp_apa_gVJSBbG0G0NM7

VISIONHMD Bigeyes H1 584PPI 2.5K Equivalent Screen 3D Video Glasses with HDMI Input https://www.amazon.com/dp/B072TY1FS2/ref=cm_sw_r_cp_apa_TZJSBbRJ5NGG8

Nothing wrong with your pi.

I use this

I'm thinking I may grab one of these, and solder a mini usb connector on it.
https://www.amazon.com/dp/B07QTJZD99/ref=cm_sw_em_r_mt_dp_U_xTUCDb27MQEYR

Most simple relays I've used have 3 connections, allowing 2 choices - either NC or NO. Just wire it for what you need.
I can't help with ordering to CA - but this is one where you can see in the pic that you can wire it either way.
https://www.amazon.com/dp/B00E0NTPP4/ref=cm_sw_r_cp_apa_i_67eACbFK3XZPA