Hi! I'm an industrial design student and this semester we are designing a cordless belt sander for one of the biggest tool manufacturers in the world (can't say who). I've been doing alot of research on belt sanders but I need input from people who actually use them! Why have the big brands like Makita, Dewalt etc. not released cordless belt sanders yet? I know battery capacity is an issue. What features would you like to see on a cordless beltsander that the current offerings on the market (Ryobi and Rigid) don't have? Attaching a shopvac to a cordless beltsander seems a bit contradictory so can the dust bag be improved? Any help would be greatly appreciated!