Here's a handy tip: I use coat hanger for everything when I need a third helping hand to hang something for spraying paint from a can, or from an airbrush. HOSE CLAMPS for automotive use are an alternative for gluing BIG fuselages together. This is easier to use than holding them with your hands, and no solvents to melt the plastic, or messy fillers, or sticky adhesives left behind from tape leaching into them after being glued.
I use masking tape for holding fuselages together until the glue dries. Assemble your fuselage as you normally would - hold it together, then put your tape onto the seam in several places so that you don't have to worry about conforming to all the different shapes of it. Then open it up again, and then CAREFULLY add your glue to the edge of the fuselage so that this will hold it in the exact spot with the correct alignment.
Popcicle sticks, rubber bands toothpicks, razor blades, sandpaper, and small styrene pieces, and old credit/debit cards are indispensible for modeling, and repairing things around the house. I melt styrene pieces in acetone to fill holes, or small imperfections in plastic models, or to smooth uneven spots, or sometimes I use it to glue two things together in large sheets. Tweezers, cotton swabs, old T-shirts, and jeans, broken appliances for wire, LEDs, old computers for the same including small parts - capacitors, transformers, wire, chips/cards with gold trim, the bread boards that they're attached to for scratch building. I use all kinds of things for the support for cutting mats - wood boards, small aluminum sheets that I cut down to credit card size for gluing small projects, scraping, paint mixing, etc. Name it - I've tried it, or made/make it for better modeling effects. Also, Harbour Freight has some amazing tools like dental picks, and the like for scribing, and other tools that you can easily modify.
~ Cobra Chris