Jeff at Crossbred performance should be able to help you out for an over the counter kit -
www.crossbredperformance.com - they also do rear diff protectors for $60 plus postage, one's on my list to get
If you decide to make your own the DIY template for the front struts will be the same as your L's, use these for the front strut blocks with 7mm offset (towards engine) for every inch of lift.
Match the strut lift to the body lift size to keep your CV's happy. Raised springs will get you another inch of lift or so, it will also change your CV angle a little bit and you will lose an inch of down travel.
My lift is 3 inch blocks with 2 inch blocks for the gearbox mounts/radius rod plate. Goes well. I've got 14's with 27 inch rubber. Its a good combination with an EJ22 powerplant. Your speedo will be out by about 10km/h give or take afew kms. Get a cheap GPS and use this as your speedo. You will need to trim the guards a little but you'll work out what you need to do.
I was going to build my lift, have been talking about it for ages - but then got a sweet deal on a second hand package
You may find the EA very underpowered for the larger tyres. I'm currently running the standard tyre diametre due to my snow chains fitting this size of tyre.
You don't have to re-gear, it is rather difficult in a subaru - you have to split the gearbox to get to the front diff and sourcing an appropriate ring and pinion gear for an L series box is easier said than done. I don't know how but most people put up with the lack of power...
Cheers
Bennie