Plus Models sells lead wires that range in size from .2mm up to 1.0mm. I just take an appropriate sized piece out, roll my round hobby knife handle over it to flatten and I get instant slings and helmet straps.
If you get some takeaway in aluminium containers you can wash them and cut thin strips out of these to make all sorts of straps, fenders, exhaust covers etc etc.
Much sturdier than normal aluminium foil and it keeps the shape well.
I saw someone doing this on youtube and I've copied this with good results!
I use a piece of the thin lead sheet you can get from the model shops, just cut of a narrow strip to suit then shape it how you want it, it will stay in shape and can be painted and glued.