Once the decks and superstructure are complete, it is time to remove the inner timber and hardboard formwork.   First, carefully remove all the timber camber boards and supports and the longitudinal stringers – a lot of this material may be useful in framing the furniture so save what you can.  You will find some longitudinal stringers and pieces of hardboard locked into the structure by the bulkheads, so very carefully saw or cut through on either side leaving the small piece intact above the bulkhead.   You could use a very sharp knife or a saw set to a very fine depth to cut along the edge where the hardboard will be later covered with a trim strip or bonding.  Some glue can be added, if necessary, to fix this remaining piece in position or, leave it to be covered with resin putty before finally bonding the bulkheads.