There are plenty of cool rubber band guns on the market. Looking for something that lets you launch faster? This Fully Automatic Rubber Band Minigun is worth a look. It has a wooden construction, powered by an electric motor. It has 12 barrels and can be loaded fast.
The kit version comes with 70 parts that you can assemble in about 2 hours without any soldering or glue. You can order this rubber band gun in black and wood versions.