questioning my choice of boats

[CaptJamesCook]

I have been looking at the Block Island 40's yawl
here is the problem;
In 2018 I intend to singlehanded (maybe one/two other crew members) to cruise off shore and blue water.
East coat of US, UVI, Gulf Mexico, Pacific, Hawaii, Aust.

I wondering how to fit an extra fuel tank, watermaker, at least solar or wind generator. would

I have also considered a windvane of hydrovane to supplement the auto pilot.

After climbing around a couple.
I am wondering if there may not be enough room for everything needed.
Along with maybe 2-3 weeks provisions and repair parts.
Am I asking to much of the Block 40?

Any thoughts insight would be greatly appreciated.