H Rod, I used very cheap one hand glue clamps for this job.
I bought them at the HBM webshop for 1 euro per clamp, and bought 50 of them.
In the photo album of my ECO 85 electric you will see them a lot.
If I ever build another boat I'll buy 50 clamps more, as you can't have enough of these.
Regards,
Jack
Nightline