captkevin wrote:
Had a 1999 200 with the sport interior & i feel your pain. Start with removing the top piece. There are a couple screws at the end & a few across the top. Then start unscrewing The back. Unfortunately you have to take out all the screws. It is a little overwhelming the 1st time but just takes a little time. Once unscrewed the whole white piece pulls out. Access is pretty good then. Wish i took pictures for you.

Here is a photo of how good the access can be when the entire rear bench is removed, from my similar year H240.
captkevin gives a good description.
I remember taking the shoulder bolts out that hold the bench seat (folding futon) to the base box, and removing the seat bottom and back together (hinges still attached). Then removing all the nuts that hold the headrest bar...two or three at each end under the gunnels (the hardest part), and several across the back. Then removing the starboard support box from the floor. I lifted the whole white starboard box out in one piece with a helper because it's very heavy.
Finding the nuts under the gunnels was best done with a cell phone camera, then reaching under "in the blind" to remove them. I have only done this once so far in 4 years. Other times I just contort around the engine.
Ray
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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings