A new thread that follows the build, covering and flying would be well received by those that are considering a first try at building vs buy and fly. Please consider the idea. I know you'd get lots of encouragement. And any snags you run into will help others.

Fuel soaking is always a deal with glider style models like this. I'm going to suggest that it's worth wrapping the covering, assuming you use an iron on, around the edges and then heat seal both the forward hatch and wing openings with a sacrificial sealing strips. I've done this on a good half dozen glow powered sport models and I was glad I did later on when I had to get into the guts. It was clean and dry inside. And removing the strips was the matter of a few added seconds.

Alternately consider attaching the nose hatch permanently and make a light plywood "sled" that holds your receiver and battery pack.

A free flight idea for a fuel tank which would give you around a 90 to 120 second run time is to use a 10cc syringe that runs top to bottom through the nose just behind the engine firewall. The rubber plug can be poked through and stub tube added for filler and vent. And the outlet is reamed out to 3/32 for a 90 bend of brass tubing that is your lower feed hookup. On the Riser a 1/8 plywood skeg could be added to protect the feed where it sticks out from being swept off. Or angle the syringe so the outlet comes out down by the lower side.

Here's a couple of pictures to give you an idea. This one is a cut down 3cc syringe for free flight. But it shows the idea. It was installed in the fuselage you see the two tanks resting on. The bent feed line stuck out the bottom while the upper lip of the syringe tube was sticking up about 1/8 inch above the wood so it was easy to seal off.