K.I.S.S - - The main reason to use fuel dots IMO is that they are simple and little can go wrong. I think most of us that have flown for awhile have been bit by a fancy fuel valve that has failed. And as Murphy's law dictates, the valve will fail (and shut off your engine) at the worse possible time. A fuel dot is just a glorified plug and socket. The plug goes in the end of the fuel line and then you shove the works back into the socket for storage during the flight. Simple. A basic hole drilled in your fuse/cowl with the lines sticking out would work... just plug the lines. The dot kits build on the same idea but they include fancy liners for the holes you will drill. Many makers of dots, GP, Dubro, MK Products, Tettra, etc.

Fuel dots I have used
http://www.centralhobbies.com/Fuel/f...ngs/CHFLD.html

Righty: Yes, a little. Tank shouldn't siphon as per your drawing; however, you may get small squirts of fuel in the muffler when transitioning from inverted to right side up. You can minimize this effect by placing a few loops (2 or 3) in the vent line, fasten with velcro, zip ties, tec. This will help stop any siphon effect.