Dave, I am familiar with the fuel valve you are using and used the same thing in my UCD with the 91 Surpass. The difference with a Fuel Dot is that you don't have a valve so one less thing to potentially fail, and if weight conscientious then a dot does save a little weight as well.

A fuel dot installation uses a third line into the tank. I used a cluck with a similar installation as the fuel draw line to the carb. I have read several post on RCU and many guys do it this way without any problems with the fuel draw line and the filler line tangling. You could also use a T off the fuel draw line to the carb, but unless you pinch off the line to the carb you will flood the carb, which is not the best way to go.

For a glow engine mounted inverted I think a fuel valve is the only way to go to avoid flooding the carb anyway. I have read of several examples of guys mounting their engine inverted with fuel dots and then having siphoning problems with fuel flooding the carb.

So, in short, if weight is an issue, and the engine is not mounted inverted, and you are not using a gasser then a fuel dot is probably the best choice. If mounted inverted and using a glow engine and there isn't a concern up front with weight then I would definitely use a fuel valve. Just my 2 cents on the topic.