The drawing looks good for the .061, one just have to be careful with having enough bolt length for the threads in the crankcase. I wouldn't bother with removing the regular engine mounts, there is hardly any weight to save there anyway.
For my .03 engine I only had the tank mount, and the plastic is very flexible. The engine vibrates quite a lot at high rpms, and the carb wears out etc.. Here I had to make a new complete backplate, a lot more work than what is needed for the .061, but it is fairly straight forward to do too:
