This one I made to accept a cluster of "D" engines.
I did do some major mods on this one, although I used the stock CR's from the kit. I used epoxy to glue the engine mount assembly in place and replaced the balsa fins with basswood. I did forget one thing and that was to apply kevlar shock cord to the engine mount BEFORE gluing it in place, that's why you see the blue tape at the bottom, I drilled a whole thru the engine mount and fed the kevlar cord thru it and put tons of glue on it.
I also added plenty of clay for nose weight. It's pretty heavy with the engines, haven't flown it yet, I need to go somewhere way out in boonies in case it's not stable, I don't want anyone to get hurt.
Anyway, here's the business end.