LLB - NADA(!) on the Aldan or Varishock on a ball-joint beam. No way those big 2.5" springs will work up next to the shock tower - or the trailing arms.
I've found (2) possible candidates for the small body front shocks needed. These will accept smaller OD 1.9"(ID) springs - AVO (England):
http://www.avouk.com/pm/12
(They have a US distributor BTW, the sell the Stalker/Lotus-7 replica)
and here in the US - ARS:
http://www.advancedracingsusp.com/shocks/1000.htm
How are you planning to secure the trailing arms from side to side movement? The only thing I've seen is an internal bushing like the Red-9 set-up, or external bushing like the Formula Vee guys use. The external looks more reliable, but don't like that there's no type of grease seal.
Jeff