Build Basic Frames for Lifting Platform

Hello I would like to buy a lift with a base frame in the near future. Since my foundation or the base plate has “only” about 20cm thickness (most manufacturers require 25cm and double armed) and there has already stood a lift without a base frame (12x heavy load anchor). I do not know how tragic it is when the base plate is already drilled with 12 holes but I can imagine that the concrete is a little weakened now. Therefore I would prefer one with a base frame on Since the choice of lifting platforms with basic frames is quite limited, I thought one could possibly build a frame or have it built by the metal builder so that one can buy a normal lifting platform! Would such a thing be possible? What effort is to be expected? What would such a frame cost if I had it made by a metal builder? Does anyone have pictures of such a frame? Would I be interested in how the columns are attached to the frame. Pillars to screw tight? Hope it can help anyone. Greetings