I actually didn’t put doors and windows on most of the houses. From the angle I look at them they’re irrelevant, and only the larger houses has doors/windows. It’ll be different for 6mm.
Does your friend know about Soda Pop miniatures? Chibi has to be the easiest thing to sculpt, also a great way to start sculpting. Peaks & Plains was actually 3mm so chibi was the only realistic option.