Console - Look at Archbuilder's thread on Project Fuggly as he did some amazing work with glass. Yes its over the top and probably overkill for your project but it does show how you would go about creating your own parts starting with a mold. You could build the console out of exterior grade plywood and either encapsulate it with glass OR use WOG's old timers formula to seal it. It may be much heavier doing it this way but it is technically possible.
As for the wiring - I find wiring very easy to do so it'd be a non-issue. Others may find wiring daunting but if you plan it out and run a wire at a time, and keep them organized YOU CAN DO IT! Think of it as working on a single wire at a time instead of wiring an entire boat. IF I was approaching it I'd probably start with the simplest circuit - the horn. Get a fuse block or circuit breaker, a momentary on/off switch, horn, and wiring. Once you have that tackled, move onto the navigation lights. Then keep going from there. You could skip running the pitot tubing for the speedo, and skip the speedo pickup on the transom, if you use a newer fish finder with GPS built in - they have built in speedos on the fish finder.
Tiller - sure why not? Looks like you have the structure for seat bases currently, just missing the tops. Easy enough to replace with some ply and a seat cushion. Make it as elaborate or simple as you want.
Motor - seems the one I linked to was maxed at 40HP. Not so sure I'd want to try to man handle that as a tiller. Before you use the 40HP as the golden standard I'd see if there was a capacity plate on your boat as that may dictate a lower engine. We had a 30HP BigTwin Evinrude (with burnt cylinder and crappy tuning) on our little MFG in my sig growing up. Wouldn't break any speed records but it would get the boat up on plane and moving decently. I personally like Honda - whisper quiet, well built,4 stroke, BUT they're heavier than snot and your boat probably isn't setup for a 4 stroke. Others here can help you with Mercurcy, Evinrude, Johnson, etc but stick with something that has parts available.
YouTube has videos on these as well with different configurations so hop over there and do some searches to get additional inspiration.
Q: How's the structure on the boat? Transom? I noticed one compartment had what appeared to be spray foam in it which may or may not be a previous owner's attempt to seal a leak.
Again, nice project. Post some pics of progress as you dig into it.
