August 6th update - Double bottom.
The double 1/4" bottom is complete. The advantages to doing this are:
1. it brings the bottom up to a substantially thicker, less flexible thickness.
2. It can be done by oneself if you choose to eliminate the butt straps. (I did the butt straps.)
After all of this, the bottom is still rather flexible in the area between frame a and frame C since there is no floor support under this area. It will stiffen up considerably after the keel plank is laid, and the bottom shoes are added. I had originally thought I could get by without the shoes, but the bottom really could benefit from this addition.
NOTE: if I were to do this again (out of the question) I would put on a single layer of 1/2" ply with 1/2" butt straps. Since I would sill glass it for weather/delamination protection there really is no reason to get obsessive about it. I had to use 3 extra sheets of 1/4" ply to do the double bottom, and I realize that I still do not have the sheathing for the keel. ( I am actually missing one side, but need an 8 foot long piece)
The keel sheathing is supposed to come from the edges of the sheets used to make the deck. Since I am going to be using 3/8" ply for the deck, and I really do not want to increase the thickness of the keel here; I will spring for yet one more sheet of 1/4" ply. Between the epoxy and the plywood, the cost of building Micro has risen substantially.
Need to purchase:
1 sheet 1/4" ply
4 sheets 3/8" ply
pintles and gudgeons
motor
trailer