Tell me about it! I have almost given up on Roden. The interior detail of their fuselages is extraordinary, except it is impossible to see any of it, so after you paint a radio box the right color and a dozen other such details, you glue the fuselage together and no one will ever see the stuff again. Then you have to deal with non-fitting parts. I had to buy two Heinkels just to prove to myself that I wasn't so inept as to find the gap between wings was caused by a landing gear box that was too high by at least a half inch. The seams problems were horrible, the canopy and other parts didn;t fit, and after weeks of trying to patch, sprue, fill and sand, the thing looked like it had been built by a blind person. I was determined not to be defeated so I bought the second one, used only the bare details that worked and still had seam and fit problems. Now it looks pretty good, but don't look too closely.
Ive had the same problems with all Roden models, incl a massive Russian bomber with Polikarpov fighters hanging from the wings. A disaster that still sits at the far end of my workbench.