69,

My Yak has a DA50 in her. Sorry can't help you with the ZDZ. I did have a ZDZ80 on a WH Extra. It was pretty much same as the DA except the throttle and choke setup was a little more complicated.

Exeter,

It is an alusion. Mine is just like yours. I did not put any kind of floor in it. I mounted the smoke tank to two balsa rails I epoxied across the bottom of the fuselage just below and just behind the fuel tank. They are glued to the bottom of the fuselage side formers. Your fuel tank is a couple inches farther forward than mine. I mounted the receiver battery and smoke pump on top of the landing gear structure in the bottom of the fuselage.