I knew it. You apologized for apologizing. Just too polite. I was thinking you might do that.

8 oz would give a lonnnng run time on a .25 engine and it may not fit. easy enough to check. If you decide you want a bigger tank just take fuselage to LHS with you for test fitting before buying. This way you can show off your work to the guy there too. You'll know what fits in the way of a mount and the tank. 6 oz would be plenty if the 8 won't fit.

Z-bends can be tricky to bend at times but L's are easy. Practice the Z's first if you decide on them.