I am really not sure where you are coming from on some of your points. The base is stable massive and extremely strong. I reinforced the structure with rebar, 6" 3/8" bolts + the a2 tool steel is additionally embedded. I also added 2 steel pipes for lifting:
Attachment 279678
The a2 steel ground steel cast fine in alignment and the linear rails are through bolted to the steel via coupling nuts and 5" x 3/8" bolts embedded into the reinforced epoxy matrix every 80mm. You obviously don't understand the build if you are thinking the rails are going to be pulled out when they are cast in place this way.
The whole base is a 2ft by 4ft x 10" rock that is reinforced with steel throughout and is monolithic. I struck it with a sledge hammer like I did and it just bounced off. I look forward to continuing to the build after my move but I am quite satisfied that the base is meeting my design goals.