I decided to take a mould of the oxygen cylinder blister to replicate the shape on the LHS under the rear seat. This will allow me to lay up a symetrical mould of the rear seat pan to send to the upholsterer for matching the foam inserts. I simply sandwiched three layers of glass fibre weave between peel ply over bagging film (to protect the floor panel) and bagged the whole lot. Once this sets, I can trim the excess and tape it down to the floor on the LHS ready to mould the seat pan.