I have an old aluminium 17" MacBook. It got retired fairly early because it suffered from a design flaw but was outside the free replacement window.
Its screen is nice, and there looks to be plenty of room inside. I have been keeping an eye on options for putting something else inside. Its mostly the power delivery for the display that I think is beyond my skill that's holding me back.
You may be interested in this Framework build that converted a 17" MBP.
https://community.frame.work/t/i-converted-a-macbook-into-a-...