The wing does not need to be clamped, just use 5 minute epoxy or just thick CA, that makes life a lot easier and faster to build. HEY I AM JUST KIDDING!!!!!! I don't clamp my wings, I lean it against a wall or across 2 chairs if the fit is very tight or I use a table and books. I use 90 mins epoxy so I can check on it.

Wheels ... they are no in line as the way it is attached causes this, its ok, you will track on the ground straight, I know it looks weird. As for the wings, there is no need to glass it, the plane is light and hence will take the Gs that are exerted.

As for the tank, you can just use 2 lines since the engine is exposed and not in a cowl, just remove the line to the carb to refuel, there is no need for 3 lines. If you wanna then its as follows:

Pressure line - upper hole, metal tube is bent upwards a little
Fuel line - middle hole, leave the metal tube straight
Refueling - lower hole, bend the metal tube downwards a little

When I say bend I mean the portion INSIDE the tank. Hope this makes sense.