I don't have a pneumatic dimpler/riveter to use on my QB.
I MUST be missing out on a GREAT tool! I do like the Cleaveland C Frame, too. Every time I whack it, it makes me feel like I am Really doing something....
Plus, it has the bottom die holder that can be used in a rivet gun.
One of my MOST USEFUL "extra" tools is a 6" x 48" belt sander.
It quickly sands the oblique/accute angles on various pieces (rollover bar brackets and others) and saves a lot of cutting, filing, shaping, fitting time for many other parts. Rounding corners of anything you can hold in your hands is a cinch. After rounding, Just deburr with a file or other tool, light sanding or ScotchBright -- presto, it looks nice.
I can take off about 1/32" inch of material from the edge of the wing fairing in about five minutes -- sanding to a scribed mark, of course, then finish as above. Fitting the under-the-horizontal-stabilizer fairing took a little longer (and several cut-and-tries) to make the recommended 1/32" gap, but it made nice to match the slight curve of the stab by carefully "playing" it over the outboard roller of the sander. (It's easy to goof it up with a little too much pressure at the wrong time and place! Be careful!
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Making straight edges after cutting with snips is a cinch, too. Just be carful not to press too hard and allow a tiny extra for filing and final fitting.
I like #60 or #80 grit for hogging off material when necessary.