Building a 3 point hydroplane from plans

Hello to all... I'm looking at building a 3 point hydroplane as a hobby. I have found the plans for 3 different types or just different plans. They're called the Hasty Hydro (http://www.muskokaseaflea.ca/staticw...d=60&Itemid=41) , Scat Cat - (http://www.svensons.com/boat/?p=HydroPlanes/ScatCat) , and the Saucy Shingle - (http://www.popularmechanics.com/outd...g/1277141.html). Has anybody built one of these? About how much does it cost? Time? What would be the expense and time difference between the hasty hydro, that just calls for a plywood sheet and build up from that and the other two that require the framing with plywood covering it? I plan on powering it with a '96 8hp Johnson that I already have as a dinghy motor. This is just supposed to be a low budget first build hobby b/c I've always been interested in building boats and I just went to a APBA race where they had little pickleforcks, so I found these free plans, and I'm hoping to get a chance to build one but money's a little tight. So I'm not looking to spend to much money. I don't plan on fiberglassing the whole thing, just the edges is what the plans call for with some fiberglass tape and resin. I plan on using Marine grade AB plywood. Whats the cheapest way to seal the plywood. Just paint a resin over it without mat or cloth or will it be alright to just use on the lake once in a while without sealing it? Does anyone have some finished pics that aren't from 1960's B&W or have any insight on which would be better from the three or even plans I haven't found that are cool. The plans call for Fir, but that's kinda hard to come by here and really expensive if I could order it, so what would be another good strength to weight ratio wood to use for this that is cheap? Thanks for the info.

 

Nobody??? Just ideas on any 8.5' 3 pointer?

 

https://www.boatdesigns.com/products.asp?dept=366