meh, sure all that stuff adds up but then you can have things the way YOU want them, not someone elses clapped out junker parts that have been sitting around baked in teh sun for 3 years that he wants top dollar for. If theres anything I've learned over my lifetime of boating is that shit happens at the WORST possible times and its usually that ONE thing that you cheaped out on or didnt replace when you had the chance.
Do it right, take your time, and post lots of pix! Boats are easy, and its VERY easy to get carried away... but it doesnt take much to get a runner... just remember SAFETY FIRST!
My suggestion is to pull everything apart. At this point you have nothing, everything is in an unknown state whether it works or not (even if you bought someone elses "perfect running boat" you still have no idea on its condition, it could break 2 minutes up river on your first trip). So go through everything one by one, take an inventory of what you have, and what you're missing. Its winter time so you have plenty of time to get things scrounged up parts wise and there will be PLENTY of deals out there. Just get it all removed, take your time now and get it all clean and the way you want it and then assemble.