Hey guys,
I recently had to level the frets on my LP project and I had one of these sitting around from my RC airplane building days.
easy touch sander
Works great with adhesive backed sandpaper, its light, and it has a nice handle. If you look through the web site, they have them in several different lengths (I also have the 22" one). When I put my straight edge on it, it was dead flat, but if it wasn't you could easily true up the bottom edge on a flat surface with some sand paper. Like you would do if you tuning the sole on a hand plane.
Anyway, it was something I hit on that worked and it was reasonably priced so I thought I would throw it up here.