My advice stay away from Z links,you would be better to do a half hi steer using a Merc steering arm,there is a write up on Suzukiclubuk.I would use astra m2 shocks on the front £9 each and transit shocks on the rear much better that extended shock mounts.Dave Jones/K9DRJ at bits4vits will do you the prop spacers and the poly bushes.As for the perches, how good is your welding??? Suzukishrek off Difflock does a wicked set of laser cut bolt on perches,you can also get the perches of ebay for £25 a set.Dave at LLama 4x4 do good quality extended brake hoses for not much money he also does rough country shocks.
Personally i wouldn't do a SPOA without a Bam bar as you may end up with S shaped springs,but again that is my personal choice.
Regards
Steve