The fit of this kit is very good, with only a few minor places needing some filing. The wings join to the fuselage by sliding into a slot lengthwise, and it is here that you may encounter problems with the fit. The problem is mainly the wing root is too thick or slightly misshaped. I simply used a file to thin the top and bottom surface at the joint slightly. This model does not include an engine, only the nozzle and a cap at the end. This doesn't really matter since you can't see inside without a flashlight anyways. Even though there isn't an engine, this kit is still a tail sitter. Before you close up the cockpit, you must weigh the front down. The instructions didn't mention anything about weight, so I simply cut 3 US pennies in half and glued the six pieces in under the cockpit tub. There are a lot of small parts in this kit, so you should really read the instructions thoroughly to not miss any of them. There are a few extra parts, which is very nice to have in case you lose some. There are a few places that need to be cut so parts can fit. Overall, this is a nice kit (much better than the Trumpeter Mig-15 I was building before this one). I would definitely recommend this!