does anyone know were i can get side panel planes for a lotus 49 or rivet pattern

I would be really interested where you got a lotus 49 from

Shooter

If you've found a genuine Lotus 49 at the back of your shed, Classic Team Lotus will be able to help.

You could try contacting the guys on these forum discussions:

https://www.gt40s.com/threads/lotus-38-ish-replica.49645/

https://www.lotustalk.com/threads/are-there-kit-car-companies-for-lotus-25-49.118063/


Otherwise, I doubt you'd find such information in the public domain. You'd have to draw your own by studying an original car.