Mine does have a payload section. I made my own AV coupler, glued in to the payload airframe and made to accept a Featherweight 29mm AV bay (and a Raven of course). It's actually a little trickier than standard as that coupler has interior shoulders for the FW bulkheads. I also made my own motor mount (same tubing, made with Soller Composites sleeves).
And yes, I reshaped and profiled the fins too. I pretty much always do this when I build kits.
And, blasphemous I know but, I actually added rail buttons to this (in matching translucent orange!). I wanted to fly it on normal rails, and don't have s tower launcher that fits.
BTW, this rocket may be up for sale very soon.
More info on this coming shortly.
ssix