The side snap closure were the pain, but they work pretty good once you get them aligned. Which isn't that easy with all the heavy and warped resin attached.

There are 4 side snap closures.
I took the stock mounting bosses of the upper hull, hollowed them out, then epoxied a small finish nail into the hole. I created a styrene washer to add more gluing surface to secure the nail from being pulled out.

In the lower hole I drilled corresponding holes through the sponsons. Now once you line up the front pins, pivot the body into place and catch the rear hull on the "L" bracket, you simply slide your fingers between the track and hull and press. The nails "pop" through the holes and secure the sides of the upper and lower hulls. They do take some tweaking to get them to line up though. I think they would work well on a complete scratch build where you wouldn't be fighting the huge hunk of resin (fighting compartment)