Under the J30 rules you may not remove that bulkhead. In addition, you may not remove the door to the head!!
From J30 Rules
1.2 It is the intent of the J/30 Class Association and J/Boats, Inc. to maintain the one-design performance characteristics of the J/30 To this end, any substantive change that alters the weight, distribution of weight, shape or performance of the hull, rig or underwater appendages shall be submitted by J/Boats, Inc. to the J/30 Board of Governors for approval prior to implementation.
1.3 Except where variations are specifically permitted, yachts of this Class shall be alike in hull, deck and keel form, construction, weight and weight distribution, shape of rudder, sail plan and equipment. All boats shall be built in accordance with the plans, specifications and these class rules. No alternatives or modifications are permitted unless explicitly stated in these rules or on the official plans or building specifications.

Larry Christy
J30 Class Measurer