Good Morning --- I have scratch built a twin fuselage Seamaster and the nose is a plastic piece but I glued a few thick pieces of balsa together and shaped it to suit. As long as you have the pod mast you are in good shape. I purchased two round 8 ounce fuel tanks. I measured the diameter and went out and purchased four of the cheapest shampoo bottles that were slightly larger than the fuel tank diameter and longer than the fuel tank. I cut off the neck of all the bottles and used the top half of one bottle to form a cowling for the engine and fashioned the other to cover and hide the fuel tank. I made the " firewall " out of 1/4 ply and made it round to just fit inside the shampoo bottle opening. I think I had enough room in front of the firewall to mount a small throttle servo and ran the servo wires down the mast. I am almost certain I did not add any right or down thrust to the firewall. The picture I am sending is a bit too small to show any detail but I think you will get the idea.