To keep it stable (Because according to some flight sims that let your model your own aircraft) this design is actually very impractical and unstable and to get the length of some parts right.
Sorry, I don\'t exactly know how to put cannons that would be able to fire AFTER launch, so this is unarmed, and I can\'t find any forward swept wings either. You need C7, C7 'Beta' and NovaPunch (I forgot which one it was from)