Going to be a great looking bike - nice work. I like the mounts, but don't see any pics of how it bolts on. I have built a fair number of aluminum tanks myself, and mounting is a key element. If your mounts simply bolt on the the frame, I suggest you consider altering them to rubber isolators. Your tank looks pretty robust, but nothing is immune to fatigue cracking from vibration. The isolators will also likely preserve the steel frame mountings - that tank will be a pretty heavy pendulum when full hanging from those long mounts.