Easy supports for the frame are cellar jack posts. They require a little fabrication but it’s simple.
-make up 1/4” plates, to anchor to the the floor, with four bolt holes.
-weld these to the bottom of the tube.
- weld the internally threaded ring to the tube.
-drill and tap, 3/8-16 worked in my case, the top of the threaded screw.
- make up some 1/4“ support plates, with clearance holes for 3/8” to mount between the machine and the screw.
-make the top support plates to suit the machine base, fasten the plates to the frame. Once you have it level, turning the screw up and down, lock down the 3/8” bolt.
The install that I did, Vince Valoice set me up with a sketch on his how to. That included an angle iron frame that was made with enough clearance to set the Pat Trap frame in. The frame was secured to the concrete pad, similar to the pad in OP’s pictures. Then the machine was set in the frame and secured in place with bolts. The overhanging frame section was secured to the floor with modified jack stands, like in the sketch. The thread screw can then be used to level the frame, then locked in place by the 3/8” bolt.