Peter. Pictures please, even partly built.
My modus operandi……
Battery somewhere in the middle for balance, and under a hatch big enough for ease of replacement.
Speed controller, anywhere, can be slid in spaces, unless you have a TURBO Puffer and need to have a lot of cooling air over the ESC.
Rudder servo, preferably able to be got at easily, simple linkage to the rudder tiller …not to complicated, I like a simple straight bit of wire.. I use plated garden wire for this.SO therefore behind the battery to the rear of the Puffer.
Reciever…preferably NOT near the motor or ESC in order to avoid interference, but otherwise anywhere. Something else that can be slid into a nook or cranny.
How big is this puffer?? Are you using a slim NiMh or a fatso 6v gel cell? I would have though that with a puffer of any size you should have loads of room for the bits. Ashley