To be honest the clamp shown in the photo you provided is a far better option and just needs on hole drilling in a piece of plate that can be done on a pillar drill. The type i described are so easy to make also, i have 4 that i use in conjunction with various lengths of stud iron to clamp stuff to my lathe cross slide when jig drilling holes ect, pack the ends with some coventry die chasers.
Regards
Mike