Thanks for the comments
@ Glen - You are most probably right! By the way, GPM publishes models from many designers and it is not surprising to see different styles on their kits. I said "easy" but I could say "tedious", too
. I find Halinki's engines much harder to assemble and not less tedious...
The engine is complete. I didn’t find the back engine former and added a card circle to fix the shape. It is red just because I used a bit left from another kit. The engine points slightly downwards from the rear bulkhead.