Here is my idea for making the fiberglass/epoxy sole plates.
I have made these two impressions of the front of the sole in these pie tins filled with concrete. The molds don't look all that great but I don't need super high accuracy. I will have to do a little smoothing of the molds.
What I am going to do is lay up the fiberglass and epoxy on the mold and then vacuum bag the mold using a cheap method to get the layup to take the curved form of the sole. This will also make the plate have a more uniform density and be more uniform that what I could do myself.
The vacuum pump will be made from and old bike pump or small car air compressor.