Ok this is roughly what I have in mind for the base. Idea is epoxy level the top of the base just to get it +- flat and level. Then put 2 layers of 16mm sealed birch ply on top and then a 5mm steel plate and secure that to the base with bolts. Apart from using bolts I really don't see another option of how to secure the machine to the table? I'm referring to the red parts in the second picture. I really don't want that to be the weak point so I'm open to suggestions. Am I approaching this the wrong way to wanting to build the router and base separately? Any advice would be greatly appreciated!
Click image for larger version. 

Name:	1base.jpg 
Views:	440 
Size:	48.2 KB 
ID:	13218Click image for larger version. 

Name:	2base_and_router.jpg 
Views:	528 
Size:	167.0 KB 
ID:	13219