Very nice! You're probably going to need a lot more resin. My vulture used close to 15 gallons to do transom, core, stringers, and floor. I know my boat is 20' but my core also doesn't go all the way up the sides like a Viper and Vector do. I don't know where you ordered your supplies but Express Composites here in Minneapolis has resin by the 5 gallon bucket (I bought 2 to start with). A lot of members here have ordered from them too.

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The shop has been super busy so I haven't been working on the boat but the race is 2.5 weeks away so I got back on it tonight. I got most of the rest of the core out and my 3/4" marine plywood cut. I made the stringers an inch taller and kicked them up to the bottom of the splashwell. I also got my materials in. 2 sheets of 1/2" balsa, 5 sheets of 3/8" balsa 4 gallons vinyl ester resin, cabisil, 1708, some 1.5 Oz chopped mat and some chopped fibers

I would like to know this too. Whats the status of this build? Pictures?

So when is this going down? Actually herd about this from a buddy..

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Foam under the floor is a very bad idea. It will start to absorb water from the first use and continue to do so. The boat won't drain either, the cavity under the floor needs to be open to allow it. Also flotation low in the boat will make it roll over when it goes down and it will likely sink anyway.

Assuming you're using polyester, I don't see anyway you can get all that material in at once and bag it, the resin will kick long before it's done.

And it no longer has to be an outboard. The other team is going to be running a twin engine seadoo jet boat. Also there are 2 more teams added. One has an 18' runabout with a 4.3 and the other is unknown. 3 races. A drag race, a bouy to bouy race and rough water race

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Just left the driver's meeting and the rules have changed to $1000 for boat and mechanical work so I can spend all I want on structure. Plus get a $200 credit for the trailer.

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I have around $1700 just in materials in my vulture. I know it's a longer hull but there is no way you will buy the materials for $700. I used just over 15 gallons of resin and i know you will need at least 10 gallons to do a viper and I used 3 sheets of ply, one for the floor. Adam is pretty much right on on prices. As for vacuum bagging, not a necessity but it is an option. I did not bag my vulture.

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I think you're underestimating the cost of materials; or just how much you'll actually need.
Unless the boat came with everything you need to redo the structure...glass, core, marine plywood, resins/catalyst etc.....or you can get it for free or deeply discounted.....


Based on prices at Express Composites / Menards / Jamestown Distributors:

A 2'x4' sheet of balsa is $25. You'll need probably a minimum of 8 sheets. $200.
Marine-grade plywood 3/4"x4'x8'...$70 a sheet, you'll need 2 sheets minimum (1 for your transom, 1 for stringers.) Unless you want a floor, thats another sheet. $140
5-gal pail of resin is around $150. 5 gallons isn't enough.

1.5oz CSM fiberglass $5 per yard in 50" width.
18oz woven roving in 38" width is $5 per yard.
1708/1808 glass is $10 per yard in 50" width.

I didn't include vacuum-bagging materials. But you'll need quite a bit of that too.
Lastly, you'll need to paint or gelcoat the interior to protect the resin and stringers. Resin itself isn't waterproof. If it was, wood would never rot.

Prices are obviously higher in Canada where I live, but I roughed out the cost to completely redo my Viper's core/stringers/transom/floor and I was at $1400. And even then I think i was lowballing it.