Finished the pvc A-frame today. Only a clean paintjob to finalise it.
Used some 32mm hot water drainage pipes (wall of the tubes 3mm for rigidity).
Once the tubes of the boat are inflaties the baseframe is wedged solid in between.
Weight is ok since i can lift it on my pinkie.
And most important for me, easy to transport (leveller is approx. 1m long) fits together with the Floreboards in a bag.
All and all i'm happy with the result.