Lets focus on drivetrain too. WHY would you pick a certain kind?

Drivetrain. Single Speed? Fixed? Derailer? Geared hub?
Split between SS and Geared hub

(IF you travel on flat a lot then the need for gears is
minimal. However, gearing of any type will make the ride
MUCH easier overall. Derailers offer much at a low cost
while internal gear hubs offer low maintaince but narrower
range.)

Brakes. Standard caliper or V? Discs? Coaster? Drum?
Was thinking Coaster rear, drum front, or geared hub with drum in back.

(overall any type of rim brake will be less costly and more effective than any drum/disk or coaster. by simple geometery
you are braking on the larger diameter of the wheel rather
than at the hub which strains the spokes big time.)