tender

I just acquired an unbuilt Bowser T-1 Duplex locomotive kit from eBay. All the parts look to be complete, but there is a problem with the tender frame - it has a significant bow to it. Does anyone have any tips on straightening a white metal casting without breaking it? Or am I just better...

I am currently in the process of converting a atsf 4-8-4 northern into a western maryland 4-8-4 potomac. Can anyone tell me which size and style tender i need and where i can get one?