I did the battery holders today, I am inclined to forget this till after the deck is on and then it's more difficult to get at, and then made a start on the deck setting out the superstructure footprint, cutting and the initial fit, next I'll cut out the access hatches, the type 42's allow two quite large hatches, I tend not to make them fit the deck structures but keep them well under, just large enough to get to what ever is under them and have an upstand around them, I use blocks to locate the structures.