One of my favourite albums of all time too!
You're going to need to base most of your tracks on the bass, I dont really hear too much guitar in there, to my ears it's all distorted bass with a dose of chorus, and lush synth pads but you are correct in tuning your guitar into B (set up correctly by a professional of course).
October Rust, World Comming Down and Life is Killing Me were recoded using drum machine sounds played on an electric kit to save money, now, I am 99% positive that I had that kit set on my old Yamaha EX7 and I am 100% positive that it was at least the same sound set for all three albums, just tuned differently, so you could start looking there for their drums.
As for their synths, I don't think Josh Silver had anything too spectacular, expensive or obsure and I am sure he even had a DX7 at one point. I used to be quite into synths and I do remember being somewhat underwelmed with what he had but 1) it's not what you have it is what you do with it and 2) I've forgotton what they were! However, most S&S type synths from the past 20 years should be able to produce lush gothic pads no problem. Try some free plug ins maybe.
I also think you would need a good sense of humour to write the lyrics too!
Good luck with this and I am sorry that i couldn't be more help, I was always into their music rather than how they made their music, I enjoyed being lost in it too much!!