1800SR spark plug removal

[jhlasher]

I have a Maxum 1800SR with a mercruiser 4.3L V6.
First time changing spark plugs and can not reach back ones.
Do I need to remove the back of the cabin to reach them?
How does anyone who had one of these boats get to them?
Any suggestions would be helpful.

[mmwjr]

Is there access on either side? May need to remove the battery and reach in that way.

[shrew]

Extensions and Knuckles