Hi Ronald,
PVA glue is fine, try to use a "weatherproof" type though, problem will be you are not allowing sufficient drying time. PVA glues will dry in about 2hrs but don’t reach full hardness for 24hrs.
Bending planks: use steam – I assume you do not have a steaming tube so make fill the old electric kettle and hold each plank in the steam, move back & forth and rotate the plank for a bout 30 seconds. You should now find it will bend more easily. If bending is still a little difficult put it back in the steam. DO NOT GLUE the planks yet. try and fix in place using clamps of some sort – sml bulldog clips, pegs, elastic bands etc. and leave for a couple of hours to dry. (If you use pins to fix them in place take care as they can split the plank) Remove the clamps, glue and re-clamp. Remember to build up each side evenly with say 3-4 planks each side. Do not finish one side first, if you do you will build a warp into the hull.
WARNING: Steam burns – so take care.
You could also use plank bending pliers, they have a flat bed on one side and a blade on the other. The idea is to put a row of notches on one side of the plank, as you do so the plank bends. I use this type to bend my matches. There are also rollers and soldering iron type benders available.
Cheers – Ken