jigeye
what I do is coat the entire radio compartment with 30 min. epoxy thinned with alcohol to seal it. Then I postition the battery and receiver where needed for correct CG. I then apply Insustrial Velcro and attach it in place. I have not had a battery pack move using this application yet. It is very similar to how campy does it, except i leave the backing on the velcro going on the fuse until I get the battery or receiver in the final position because with the wood already sealed, the adhesive will grab almost immediately and will not let go.
Hope this helps.