Right now, my setup is a macbook in a roost stand, with an ipad propped up side-caring. Decent mechanical keyboard + mouse and a best effort at hiding wires. Would love to hear about other options.
Trackballs are nice to have in addition to mice.
I used a 17" DIY portable monitor for about two years when I didn't have a permanent workspace and the only complaints I have about using it are solved in most commercial models, I just stubbornly wanted to use my own. Just be careful with the cheap ones as they often have the same problems: poor viewing angles, no backlight adjustment, wobbly kickstand, multiple cables required....
https://www.pulse-audio.co.uk/product/pls00453/
The lip around the platform (to prevent a projector from falling over the edge) may interfere with your ty[ing if you have a very thing laptop, however.