Hi Chris,
No real reason for the 150% other than I've never done a monumental and since I've been doing miniatures lately (25% life size) it is a nice change to spend some time at the other end of the spectrum.
Problems are that the max load for my stand is 100 pounds. I'm at about 120 here and it is fairly unstable, so I don't move it around. Another problem is the same as you would have working on a huge painting - you are working up so close to it that you constantly lose perspective and have to keep running to the back of the room to look at it.
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