I built this model a number of years ago. It is fabulous when finished. Really big.
Go here to see my finished model. There is a link to my WIP of the model. The model has a lot of issues. The WIP solves those problems. https://cs.finescale.com/fsm/modeling_subjects/f/2/t/177401.aspx
I finished my model in Bare Metal Foil (8 sheets).
Regarding the tail sitting, the model needs a lot of weight up front. First I glued lead weights under the cockpit floor.
Next, I filled a plastic bag with lead balls and filled the bag with white glue to prevent the lead balls from moving.
I wired the bag to the area behind the pilot/copilot area. This area is not visible once the fuselage is assembled.
The result is that the model sits on it's nose gear as it should.