For what purpose?
why not something like this?
7 Gauge Commercial Olympic Heavy Duty Multi Power Rack
I had to read what you were asking.
I reckon you have the option of starting and ending the lift off the pins whether standing inside or outside the rack.
what about the Matrix from Kettlebells - Iron Edge Fitness Equipment - Train Smarter with 'slings' instead of safeties if you are not confident with the spotter arms ? (does require bolting to the floor however)
I don't know much about Olympic lifts.
But is this what you are talking about? [YOUTUBE]Charles Jerk Recovery 100x3 3/16/09 - YouTube [/YOUTuBE]
buy any rack, cut the uprights and weld in more tube... make it as tall as you want...
75x50x2 is abotu $10 a metre
100x50x3 about $20 a metre.
add in a hundred bucks or so for welding if you can't do yourself (heck, even $200 including cuting and drilling), and no worries