enlarging icebox, converting to refrigerator/freezer
So the latest boat to strike my fancy during my search lacks a refrigerator. The icebox is rather small too. It's going to cost me at least a couple boat-bucks to have a refrigeration system professionally installed, so I've been thinking about how to get more for my investment: build a bigger fridge than I have now, add a real freezer, do the installation myself.
I haven't looked in detail (and I won't get a chance until/if I buy the boat, I think), but a cursory inspection tells me there is probably some dead space under the counter in the galley where the icebox is. What would be involved in increasing the size of the icebox to use that dead space? I presume some fiberglass work, some insulation... what's used for the interior surface? Awlgrip? Any tutorials on doing this? How hard is this, and is it worth it?
If I'm going to go to the trouble of enlarging the icebox, I think I'd like to build two compartments and have a legitimate freezer. I guess the divider between the two compartments wouldn't need to be as heavily insulated as the outside of the box. Any thoughts on this?
Lastly, is it feasible for me to do the install of the refrigeration system myself? Perhaps everything but the filling it with refrigerant part? Do I need to think about this when building my new icebox, or are they discrete steps? I was thinking perhaps of having someone professional design the system (and possibly supply the components), then I'd install them, then the pro would come back and charge the system with refrigerant.
Thanks for any guidance...