Gilmark Fireball Clone Repair

[ANZinSpace]

Hi,

This is one of two clones I have of the Gilmark double decker rocket. They're both attributed to the Fethalite brand (an Aussie make) and both are missing the rear tail fin and exhaust. Based on Tinman's repair of the Pyrotomic energizer (http://danefield.com/alpha/forums/index.ph...mp;hl=pyrotomic) I figure the tail fin should be an easy repair for me to do but the cone shape of the rocket exhaust is another matter. The vehicles themselves are around 4 inches (10cm) so the exhaust by my estimate should 1/2 inch (1cm). Any suggestions would be appreciated.

Current look -

Virtualised repaired version -

Underside -