1/4" Aluminum for an adapter plate?

I need to make an adapter plate to mount my 7tm tele bindings to my Voile Insanes using the factory inserts. Is 1/4" aluminum going to be strong enough? Any better recommendations?

1/4" aluminum stock is what B&D uses for their adapter plates...though you probably already knew that.
www.bndskigear.com/adapters.html

but given your capacity for prying bindings from skis, perhaps a 1" solid steel plate would be more appropriate?     

Heh -- Home Depot was all out of 1" titanium, so I'll to go with the steel

onlinemetals.com is an excellent source for small stock, if you're searching.

3/8" seems way overkill, so 1/4" is probably just fine. Might even get away with 3/16" or be able to carve excess away from the 1/4" plate.

Let us know how it turns out!

The lightest option would be to conventionally mount the 7TMs -- offsetting aft a bit to avoid interferance with the inserts.

Marcus - There's lots of grades of aluminum with varying degrees of hardness.
I suspect T-6 aluminum (used a lot in aircraft construction) would be more than suitable  for rigidity purposes.  Annealed (soft) aluminum would likely bend at 1/4 thickness and the screw hole threads would likely strip out even at one inch thickness with the loads it sounds like you are putting on your bindings.

With that amount of strain on your fasteners I'd still be a bit concerned about the threaded holes that you need to put in the plates even with T-6. There you have the choices of fine vs course threads or (steel) thread inserts (such as helicoil and the like). You could either go with the one or the other of the thread types (pros and cons of each) and see if they hold. If not, go with the inserts. Or you could just do it right to begin with and go with the inserts... a little more expense but then you would have a bombproof adapter.

Were I in your shoes I'd go to a few metal fabrication shops and show them what you need and get them to give you an price for a set or two. For most of them business is pretty slow right now and you may find someone with scrap material on hand that would build you what you need for less than you could imagine.  Once you had 2 or 3 sets you be set for life (or until you switched to AT after which time you wouldn't need them any more. )

Life in these areas (and possibly others) will probably get simpler for you as you get older