Welcome to the world of Montgomery's, Dave, I assume you received an answer via direct response regarding the build sequence. Our M-15 is hull number MMP 151770781 (Montgomery Marine Products, 15', sequence # 177, built in July 1981). I don't know when M started putting "cavernous" lockers on board. Mine are small. I keep my Danford-like (without the rod protruding out either side) anchor and a small mushroom with their rodes in the starboard locker with a thin foam wrap to keep them from banging around, I keep two bumpers, spare lines, a small tool packet and distress flares in the port locker. It isn't unusual for me to toss the bumpers into the cabin back under the hatch. They ride quietly there. I've lined the front locker (under the V-berth) with a styrofoam box which once served as my ice chest but now houses my deep cycle SLA battery and sundry spare parts. I've just this year purchased a 12"x12" access port cover and intend to install it on the seat astern of the port hatch. That will give me access to the "cavernous" wasted space under the seat and easier access to the motor mounting hardware. Stan, M-15 177 Carol II