One thing you need that is uber important is the hard hydraulic lines that run from the front of the car to the back, and then up front again.
Hydraulic pump, high pressure line to hard line, struts, hoses from struts to accumulators to valve, valve, linkage, rear sway bar with arm for linkage, reservoir up front and low pressure return hose. [gas line works fine for this]
Quite an undertaking. Would be soooo much better to find a wagon with the SLS already installed. Who knows, the setup on this one might be somewhat less functional yet acceptable....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John