Ennis, the astromech is actually just a repaint of the preview R3, the one just after POTJ.
Chewie, I'm very lazy and usually use materials on hand, so the gun straps are just the clear bands that pack with figures that hold accessories to a figures hand.
In fact, you can buy those bands over the counter, they are essentially hair bows and can be found in the hair accessory section of any Target or WalMart.
