If you intend on making everything yourself then I'd suggest looking or components that mimic your desired result. For a motorized platform look for something that already has those components, like those automated shades for windows, they have remotes for them too. Really you are just looking for a slower moving motor with a remote, this shouldn't be too hard to find as you don't need anything industrial-strength. Try looking through the thrift store, they have loads of junky electronics which might just work for this application. Good luck!