RE: Tissue covering
The RFFS runs on 1 cell with a max voltage of 5 volts. There is a board that you can add to the RFFS that lets you run it on two cell and get more voltage to the motor from [link=http://users.joplin.com/~bselman/]Bob selman's site[/link]. The two cell board does improve the power you can get from an M-20 or N-20. Two cells may have toasted it...
The decals are inkjet printed decal paper from [link=http://decalpaper.com/]DecalPaper[/link]. You have to spray the dried image with Krylor clear before you apply them to keep the ink from running. They work good, but large ones are hard to work with, especially over tissue. The smaller ones worked fine. They are much easier to use on foam.