Its really not that hard to shorten the axles and LCAs, I just completed a rebuild and installation of a Jaguar POSI IRS in my replica. I done the shortening of LCAs and axles myself and picked up all the brake rebuild parts from Rockauto, I also replaced the hub carrier bearings with home made UHMW bushes.
The key to LCA strength is to weld on gussets, I also used a solid round to bridge both LCA pieces. You can find the parts on Ebay, I would find the parts and get a good machine shop to shorten them. When shortening the LCAs and axles, you have to measure, measure and measure. Because Jag IRSs use shims to set the camber, the axles and LCA must be set to the correct length to get the correct camber starting point.
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