We put some meters UD carbon on the bottom, 9 pieces side by side 4 cm wide a bit wider than specs but the 4 cm wide was the only UD I had and it was relative cheap. This was a job for two persons because the UD wants to roll up. The first one starts to roll the UD over the bottom and the second one goes directly behind with a roller and epoxy to wet it out. After every role I used the squishy. We then did overlay the the UD with a layer 250 gr 0/90. In the middle we put an extra layer of 400 gr 0/90. After that we did some lunch and I than started with some prep work of the side middle section.