Thank you for your reply. We need detailed dimensions tube sizes etc. the Elan workshop manual has a great drawing with all the sizes and I had hoped maybe the Esprit manual would have been the same.
Might be worth watching Soup Classic on YouTube. He is restoring a Esprit and has done loads of work on the chassis. I know you're not going to get exact measurements from it but I imagine it will still be useful.
WW The lotus forums is probably the best place to ask . My chassis is completely restored ( and nut and bolts suspension rebuilt etc) and you are welcome to measure it but there will likely be someone nearer to you on Tlf . I’m in Worcestershire . Hth