Buoyancy Calculations

I did some work calculating the average buoyancy of my 32' Woods foam build.

I come up a bit short on the hull weight. We weighed the hull on a crane scale at 1500.

The calc accounts for 1260 on a first pass.

I also get positive buoyancy of about 1200 pounds on hull materials. The boat is corecell 12mm and epoxy. I calculate about 200 pounds cores, 350 glass, 300 resin, 200 pounds resin and tapes, 100 pounds seams and fillets (short).

Does anyone have any guidance or experience to sanity/gut check these numbers?

Note: I did not account for my watertights herein.

Thanks.

 

I suppose I can also use my raw numbers to net out densities, but have not done so, yet.