Pi 4 would work great in this case. Links down below:

https://www.amazon.com/CanaKit-Raspberry-8GB-Starter-Kit/dp/B08956GVXN/ref=sr_1_3?crid=1BFNZGUQ69J2X&dchild=1&keywords=raspberry+pi+4&qid=1626192905&s=electronics&sprefix=ras%2Celectronics%2C182&sr=1-3

​

Note: There is many options and instructions to put Windows 10 on Pi. Find one that looks like you can understand it.

https://www.tomshardware.com/how-to/install-windows-10-raspberry-pi

I don’t have a exact cost because I also cut out the picture mat and used some scrap wood to extend the picture frame on the back to enclose the raspberry pi.

Screen - Amazon Link

Raspberry Pi - Amazon Link

Frame - Amazon Link

Are temps an issue with the pi 4? I'd have a fan and heatsinks on it. I'm looking at this kit on amazon right now.