Yes! The individual parts (straight piece, funnel, etc.) are made of flat pieces of wood that are glued together, but the parts are attached to each other only with wooden clips, and can be easily disassembled and re-assembled in new configurations.
Everything you need comes with the kit. Each kit includes 25 wall discs with 3M Command adhesive tape for easy assembly and subsequent removal without damage to the wall. No screws or nails are required!
No - as long as you assembled Wonderstructs on an approved surface (drywall, glass, tile, wood or metal). If you are careful as you remove the wall discs - by slowly stretching the wall tape out - there should be little to no damage to the wall surface.