nrg mc3 172 help

I have an issue with my nrg mc3 172 build that I hope someone can help with.

Simply put I've already got the engine in the bike, cooling system all works the problem I have is that the frame is hitting the thermostat housing...

Right at the front under the seat is a support bar the is hitting the edge of the thermostat housing, right where the water pipe connects and it has broken off a small bit of the metal.
The hose still connects but splits the hose every now and again.

I have already ordered a new housing and sanded down the existing one for now.
Any suggestions for after I fit it?

 

file the frame down a bit /or modify the it

 

like roxy boy says, modify frame... or you could try and modify the engine mounts

 

It's not the engine mounts, the the frame.
Filing won't.work, I've spoken to a friend, I think I'm going to go with cut and weld...