I don’t think you’l ever get an answert to questions something like “how would I do it - please make the game for” me 
- possible with UE, yes of course. Which computer you need for your users depends highly on how you create the game (how many meshes, how many polygons, materials is a big performance point, lighting, …) - so to sum up, it is possible and even to target mobile devices so little performance, but it depends on your skills hope to have helped a little bit - just write a rought game design doc and get started with the small steps