That looks like a nice front suspension, what kind of bus, it doesn't look all that big?

Here's how I put air springs on my AD truck
http://rides.webshots.com/photo/2324065910080251109mrqkVs
Pretty simple to do, still have the leaf springs but they are weak enough that the bags bottom out with no pressure in them.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-