Again, not entirely necessary IMO but I would do it if I were in your shoes. Perhaps just drill a hole and tap a brass NPT 90 degree fitting or something? Doesn't need to be strong, just leak free. Its only going into the thin sheet metal but it might do. *shrugs*
Or use gas tank repair putty. I used that to repair a massive leak while wet with gas once, from CT for about $5. Its hard enough to drill and tap when cured. I bet just putting it around the pipe going into the hole would do.
Well, I attempted the fix last night. I think it should work, but I'll have to wait until after the weekend to install it and find out.
Ended up sealing the holes with the gas tank repair putty (pretty cool stuff) and drilling a hole for a 1/8" NPT elbow with a 1/4" hose barb fitting on the other side to hook up to the line in the car. Sealed the connection to the tank with more putty.
Well, I figured it was time for another update... been driving it now for ~2500 kms with various issues being found and dealt with, and I'm almost happy with it now. Finally got the summer wheels re-painted and on the car today, only to discover that my mechanic used lip weights to balance them on the inside lip and the front wheels interfere (just barely) with the struts.
I'm taking the front wheels back in tomorrow morning to get re-balanced using stick-on weights.
As for the painting... I'm reasonably happy with how they turned out. Definitely not a professional job, but waaay better than they were before.