Nothing's impossible with car mods really. There's a lot of re-engineering of the chassis to be done though. You'd need to turret the rear arches for the coilovers to have a top mount, fabricate trailing links to locate the axle and a panhard rod to stop it moving from side to side. Then there's all the bracketry which would need to be made and welded to the chassis, including strengthening the mounting points. Not to mention all the precision measuring that would need to be done to make sure the axle retains the same position and articulation with relation to the propshaft. If you can do all that yourself it might end up costing you about the same as buying two new leaf springs. If you have to pay a specialist to do it then just buy new ones.
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