I think it shows a few on here do not know the work that goes into making a tank frame up, the fitting is easy part normally.
Design a frame then buy the metal get fabricator to make it up, hope it fits the tank, have it powder coated then get the bolts and fit it.
Let us all know the cost.
I know if I had to do it again I would be using a company as it is a ball ache both times, I have had 2 tank frames made up, one for flat 650L tank, the other for 2x 250 upright tanks, also have a purefreedom system fitted