I must be crazy after that I can still fill some cloth on the side so I put another coat on
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You must be using glass with a coarse weave. Three coats if applied evenly should be more than adequate. My guess is that the epoxy you are using is light viscosity? When you roll it on, it wants to run down hill. I have also noticed that on the coarser e-glass, that the glass hardens with the weave of the glass, but when sanded, you don't hit glass.
When you put the fairbody on the stringers and flip it right side up, you will be adding still more tape and more epoxy so don't worry too much about it.
Before installing the side panels, I would glass them while they are flat! It is much easier to fill the weave when the panels are level, especially when using e-glass. I used volan, which has a fine weave. It is much easier to get a fine finish, but it is quite a bit more expensive. I was given enough volan to do the entire hull by a good friend.
I built the side panels so there were two panels for each side. I raised them into place with a chain hoist which worked really well, enabling me to adjust it to the correct height with little effort. I made a post about the technique on one of my blog posts. I scarfed the two large panels in place, which was really quite simple.
