Dr. Speed, Brent, unfortunately there is nothing in the Lola Archives on the T497, at least nothing that I have found to date. Regretably there is almost nothing on any of the T49X series.
If you haven't already contacted him have a word with Glyn Jones who is Lola's Heritage Coordinator, you can reach him at:
GlynJones@lolacars.com, he might be able to help with any drawings that Lola still have.
You may have noticed there is another T497 owner on the Chassis Register, Reynold Watt, I'll contact him and ask if he has anything that could help you.
Talking of the Chassis Register, if you would like to let me have the chassis number I will add it. Also if you would like to let me have some pictures and any history you have on the car I would be happy to make up an individual page for it.
Gerald.