Originally Posted by quaoar
Total cost for repair and strengthening is estimated to about 3100-3200 GBP. This price includes...increasing the size of the knees...making it almost impossible for the transom to flex
As no-one 'knows' the facts of how all this came about on your boat I guess I'm curious as to why you're paying someone a shed load of money for "strengthening" to make it "almost impossible for the transom to flex". Everything
used on a RIB (or any other boat or a car or a plane) flexes, it's just a question of by how much and is it allowed for in the engineering.
The transom will 'flex' if the boat falls off its trailer on the slipway or if the boat is hit up the rear by a cross channel ferry. These are called 'accidents' and are quite likely outside the engineering specification of any RIB, regardless of the manufacturer.
The transom will also 'flex' with (amongst other things) outboard motor torque reversal and such as this will be catered for within the engineering specification.
Why are you assuming that operation of the boat within its design parameters must have cracked the transom and that you therefore have to pay to uplift the engineering specification?