Nearing completion of port side stringers under engine

I replaced the two original gussets and built a platform for the main engine water lift muffler today.
At least I completed glassing them in today. You can see the back end of the transmission at the lower left corner of the picture.

Here is one of the gussets. I made them out of 1" thick Nida -Core which is a 8mm Polypropylene honey comb material. Easy to cut, the only problem is to get the radius tops. I tried sanding to material on my 48" belt sander than I filled the holes in the exposed cores with resin thickened with wood dough. It worked fine but was a little messy to do. I used foam fillets where the