OX frame strenght to move around the shop

Hi

I would like to built an OX of about 1500x1500, but my workspace here is quite tight. For just the OX alone, without bolting it to any table or so : how strong is it. Let say: If I flip it over the wall, is when I will lift it, all the
frame will distort ?
I might plan to put extra corner bracket , but by itself, is that strong or if you look at it too much.. it's too flimsy to move.. ?

Thanks