Attached are pictures of the base I made for the mini swage block.  It was assembled from 4"x4" treated pine sections bolted together with 1/2" threaded rod.  1"x1" angle is attached with wood screws at the top to keep the swage block in place.  It fits snug in the base notch in the verticle position.  I think this will work well.  I may brace it to my work bench with a bar clamp if needed. 

Looks like it should work well.  Since there are sedom any torquing or bending motions with a swage block in my experience I dobt that you will have to anchor it to anything more solid.

"By hammer and hand all arts do stand."

I like it. I mine is similar if larger. Judging by the angle iron I'm thinking the square through hole is around 1 1/2"+ on a side. 

Frosty The Lucky.

I need to make something like that for my mini hollands block