RE: Tunnel Vision
The tank out in the open isn't so bad as 1/3 is recessed in the fuse... a person could make some type of cover to "Hyde" it....
It really can't go in the wing unless you use some pump system for a glow engine... you just won't get good fuel draw otherwise...
Now if you went to GAS... well that's a different story. I'm getting another one to go gas with and may very well build a hatch and install the tank in the wing and use the tank bay for ignition & battery.
A BME 44 or 50 is perfect for this aircraft as they are railmount engines. A conversion of sorts could be done to mount rear stud engines pretty easily too though.