completed stand assembly today. stand leg and angles have good design and even a person with my experience is not able to screw up the stand. first impression of stand is very good and i think it is very sturdy. was short of few bolts but took a sample to local hw store and was able to find similar screws. if anybody is reading this log and want to make the stand, you may want to consider getting a single tubing piece for long span instead of two pieces. stand design will support single tubing piece from center leg.
XZero is shipping profile tomorrow, this will give me few days to rest and may be make wood shelf on the stand.
one thing more ... caster holders are from XZero and George pointed out the casters which will work with the cater holder. i think i paid $25/caster and am surprise with the weight rating and quality of casters. casters can also be used for leveling purposes. i think i saw similar casters on one web site selling for $85.