Ti frame's Chain Stay is too wide.

On May 8, 6:28*pm, Kuzmin Ski Technology AB SkiTech
wrote:
Hi,
I got a nice titanium frame and fork and will build a nice hybrid bike
with 28'' wheels:
Shimano Ultegra ST-6700 STI 2x10 Dual Control Levers 10-speed
Shimano Ultegra FD-6700 Front Derailleur 2x10 10-speed
Shimano Ultegra FC-6750 Crankset 2x10-speed
Shimano Deore XT RD-T780-SGS Rear Derailleur long 9-speed
Shimano Deore XT CS-M771-10 Cassette 10-speed 11-34
Shimano Ultegra CN-6700/6701 Chain 10-speed
Tektro RX 5 Mini V-Brake

But I got a problem: The chain stay is too wide, and I cannot properly
mount the crankset - 50t chainring touches the chain stay. Thus, I
need about 4 mm deep dent in the chain stay for proper seat. How I can
solve the problem?
My own suggestions:
1. Take hammer and make 4 mm deep dent in the chain stay. Probably it
is too dangerous for the chain stay (weakening of the stay);
2. To get SRAM Truvativ X9 GXP Crankset 2x10 (extra costs), and mount
it instead of Ultegra FC-6750. Chainline of SRAM Truvativ is 6 mm
wider. It should be enough;
What about my suggestions?

is it an mtb frame or a road frame?

Never tried putting a road crankset on an mtb, but i can imagine the
larger-than-anticipated rings being problematic?