Maximum scanning depth can be 2 meters, but sometimes it is not enough. For example - for scanning steel frame (large and fast setting) I start with one leg, then continue to another and when I get to the first one, the scan is not aligned. If there will be 3 meters depth, I can start from bigger distance (from steel frame) and then I will get closer.
I would break the scan up into several smaller chunks if the frame is SHS or pipe /channel, you’re going to need to make some unique markers, eg 3D printed, placed at the areas of overlap for the scan. This will allow for alignment hanging during post-processing. Make sure the area of overlap is large, hence your markers will probably need to be a linear, unique feature mounted with magnets
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Yes this procedure with markers and e.g. unique pattern desks is suitable for clean environments. But in my case it is old, rusty and greasy steel frame from roller conveyor, it is situated in basement and on the floor there is water everywhere.
That rust dirt water, it won’t matter. I’m talking about making your own 3d printed geometrically unique marker that you can use as points to manually align in CC, They can be taped on or held on with bits of string, wire, zip ties or hopes and prayers. If you’ve got a job to do, you do it. The fact that it is rusty and greasy is going to help, not some coded point marker that you stick on