That's a real bummer Jay, but as Andy says at least you are OK. The bike can be fixed up.
I think I have an MC21 OE chamber, which you can have FOC, I' won't be needing it.
If it's any consolation, how my Cadalora NX5 tank started out (when I stripped off the paint and pulled out all the filler) makes your tank looks like a few minor scratches!
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30