Hot, if not boiling water should straighten out the hatch, resin parts usually warp once they've left the mould, making them warm allows them to resume the shape they should be. As for building it'll be pretty much like working with plastic except for glues, use cyano or two part epoxy. Removing parts from the casting blocks or runners will probably need a razor saw as using knives or cutters can do more damage than good - and remember, always wear a mask for sawing or sanding resin, the dust is nasty stuff! I love Ferrets, have built an Accurate Armour one, have a Cromwell one on the shelf and in the distant past had a Dartmoor one ....... Any questions just ask as I'll be keeping an eye on your build!