+xIf I understand correctly you will do wet layup in open mould.
In my opinion you should do every part separate and leave overlap so when you close mould, you can roll those overlaps and form joints to make 1 part piece. If that's what you are asking xD
If I am not correct I am sure someone else will correct me.
This is what I think, sorry my english is not the best, I don't know if you understand me... but I understand you XD... what about the failure join, can I repair with body filler ??