Hi Paul, yes the funnel was a bit tricky, I trimmed both halves almost to the trim lines then placed a sheet of 300g silicon carbide paper (wet or dry paper) on a flat serface and rubbed the joint of each half intill I achieved a good fit then held them together with sellotape, then used a few spots of epoxy across the inside of the joint, when set removed the tape and applied body filler over the inside of the joint when set this makes the funnel rigid and strong then used the the same rubbing method for the joints, to rub a good flat base, and finally rubbed the out side with 600g wet paper to blend in the joints, I did 'nt worry too much about the inside as when painted black you don't see it.
The main turrets I think are originally meant to be bonded straight to the deck and be static I wanted to make mine turn so yes I did fit a base to them using 1 mm plasticard I placed the turrets on the card and drew round them trimmed the bases leaving the line in but before you bond them in place fit a 20mm x 2mm bolt through the base in the centre and hold it captive with epoxy over the head, now bond the base to the turrets and trim and sand to a good finish when painted you don't see the joint, you now have turrets with a pivot shaft,drill a hole in the deck and place a clearance washer between the deck and the turret so it turns freely, I then put a coil spring on the bolt under the deck followed by a nut, tighten to the right tension followed by a spare servo horn and another nut tightened on to the horn that's how I did it, of course you may have your own method. anyway I hope this helps.
