I'm building a 1/4 scale Waco with a G62 where the carb fits inside the cowl with about a 1/2-3/4" clearance. I don't want to cut the cowl and have a stack hanging out. Will there be much of a mess on the inside of the cowl from the gas that spits out the of carb? I have to believe it isn't a big problem, otherwise engines with rear carbs would make a real mess of the inside of a fuselage. So, if no stack is really needed, how difficult would it be to start the engine with no choke? To open and close the choke, a small hole would be needed in the cowl, but certainly wouldn't be as bad a having a stack hanging out.

Sorry, forgot to post the picture before hitting the OK button

Since the carb is enclosed in the cowl, there shouldn't be much, if any, of a siphoning problem. Starting the engine without being able to choke it is another story. If you really don't want the hole for the choke actuator, use a spare channel and linkage to actuate the choke via servo. However, IMO, the hole and choke actuating rod will not be detrimental to your plane's appearance.

Dr.1

Or put a very small hole in the cowl, small enough for the plastic extension that come with the can of WD 40..A shot of it used to work, maybe it still does...