No reason you can’t, I would think you could find a decent location up front to put a pedistal mount, I suppose you could build in a casting deck, all depend on your style of fishing. I pretty much have an open bow set-up on my boat, I have a rather large area in the middle of my bow that is lower than the rest of it, personally I find I have enough room to cast, otherwise I could build (or buy) a piece that goes across the open area for more casting room, I don’t find the need myself. If you want a bow mount trolling motor that will probably take a bit of thinking and some work, but you should be able to figure out a good way to put one up there. Minn Kota makes a ton of different adaptors, and there are others on the market.
Livewell wise there are options out there, never really looked into it, just make sure you consider the location and the weight you’ll be adding to it. Water weighs about 8#’s a gallon so it adds up fast. Personally I’d probably look at a cooler type livewell, which wouldn’t require a lot of cutting and running pipe. Maybe one that fit nicely in the open part of the bow, that you could stand on. Not sure how reasonable that is, but it could solve 2 issues.
I see plenty of trihulls out fishing, most of them do not have trolling motors and if the do they are usually transom mounted. Seem to be more than enough fishing machine already.