AI am supposed to make a guitar to stand against an amplifier cake. I was planning on attaching the rkt to a board with royal icing and covering with fondant. Will this work ok or is there a better way. Any help will be appreciated.

how big you makin' the guitar and amp approximately?

what kind of board?

AThe guitar will probably be around two feet tall. The amp will be about a foot tal. Not sure about the board. I thought cardboard probably would not be stiff enough so maybe thin plywood

i gave up on plywood long ago--too heavy for me--and then you gotta keep it from crushing the amp--not that the guitar won't be plenty heavy too but no plywood for moi--

for a two foot guitar i would use half inch foam core-- and i would board & dowel it like any other cake--i've never been sorry for a little too much internal structure-- and make sure it stays put at the correct angle--and i would most securely attach a yard stick or some piece of wood to brace up the foam core base too--so the neck  unquestionably has enough strength--

some inspiration ^^^ maybe... ;)

and you could support it through the amp too--maybe i could drop by & be your consultant