Kits I have built have pretty good instructions on mounting servos and control rods (IMO it is better to have servos handy during construction) however a big part of the construction can be done without them, (Read completely through the instructions before starting)
I have limited room so for my building I have a folding card table, on top of that I have a 2 foot, hollow core, bi-fold door (will fold to 1 foot wide for easy storage, paid $35 at ACE hardware) on top of that goes 1" thick blue foam insulation (dow board, about $13 for 4'x8' sheet)) works great for me and my building surface is 100% flat and can be easily packed away when needed.