A common mistake when making a model airplane is to start by putting glue all over the parts. That just creates a mess. The wrong bits get stuck together, wings get stuck to the floor, windows stuck on your fingers. It only complicates things when you introduce the glue too early.
The way to build a model airplane is to first organize the parts. Make sure the pieces fit together and nothing is missing. Then gradually apply the glue, and join the various parts, piece by piece, until it starts to take shape.
The parts may not fit perfectly at first. You may have to shave off some rough edges, or bend some parts into shape before they click. Minor imperfections can be overlooked – a dollop of glue can fix them up. With a bit of work it all comes together.
But if you find that there are parts missing, or they don’t fit, then you don’t have what it takes to make an airplane. You can’t use glue to join mismatched pieces, and certainly not to replace missing parts. Don’t even try, just look for a better model.