though his stuff isn't very detailed you might find something useful. otherwise I always find it cool just to waste a couple hours browsing through his extensive photo galleries. you'll have to register to get the full benefits (its FREE) but its well worth it.
When I bought my MP4/6 from hlj.com I bought the Ayrton Senna F1-modelling magazine as well. In there they have pictures of every F1-car he ever drove. If you want to I can scan the pictures and send them to you. Just PM me.