Fuel tanks?

[Talonmotorsport]

I've been asked for a price for Roadster fuel tanks in mild steel and ally. Does any body know of another company currently making them?
Would you want a new sender unit ready sealed,try and make the donnor one seal or not bother if it was for race type use?
Mild steel would currently not be a problem but will wait to see if there's any interest in ally before I invest in a TIG.
Thoughts, ideas please. Prices between £45(ish) for basic race type and £85-100(ish) for tank with new sender fitted.