Hi Dave, Thanks for the advice again. Pretty much what I usually do too. I normally vent straight down from the bottom (though I have had traces of fuel escaping and blowing back along the fuselage bottom). Sometimes, like on my Jetlegend Grippen I used a bit of brass tube pointing sort of down and forward.
So I made up my mind and here it is. The vent is on the access hatch, just off centre and pointing a bit forward.
And I settled on two carbon dowels and a little screw to hold the hatch on.