I'd price the Warp 5 engine at -6 actually, because you're ripping off the nacelles and the warp core and replacing them entire, and I will insist that you're gonna need to do more than just say 'this is a science lab now' to the cargo bays. So it's more like 12 industry than 5-7 if we're reconstructing to that extent. A +8 to science is absolutely absurd for a ship of this size however. A ship 1/4ththe size of the NX should not have twice the exploratory ability of the NX. You might say there's lots of room in the cargo bay but is there? Is there really enough room to put in specialized exploratory sensors, two laboratories, and a backup computer core without cutting into endurance?
Again, we don't know what refitting a ship will cost. Though I'm still not sure how you're figuring on a 21 Industrial Cost for a new-build science
Merchant, or some of your other assumptions.
But, is it just as ridiculous that the
Merchant should have an Engineering stat of +6 in comparison to the
NX's +7, while being so much smaller? The size of a ship isn't the primary factor in its stats, just what all it can fit inside, which the
Merchant was designed with in mind. The
NX has more to consider than just boosting Science as much as possible, which is why it's got such a chonky stat-spread of +8, +7, +4. And "exploratory ability" isn't a stat, at least on our end. Science probably isn't the only thing that affects it.
The +8 Science was a maximum estimate if one fit the extra computer core, two Science Labs,
and Advanced Sensors, with no consideration for anything else. More likely, if you want to keep some of the cargo space, it'd be something like +4-6 Science instead. It's also uncertain if the, again hypothetical, Advanced Sensors would need their own space, or if they would be an upgrade to something like the navigational array.
Oh, certainly. You'd need to power the entire section in order to even have life support (which it lacks at the moment), never mind to run functional computation or analysis systems, or storage of specimens, or anything sundry. The power requirements would then be a drain on a warp core that wasn't designed for it, so that would need replacing, as would the spaceframe since its warp field dynamics can't handle higher speeds, making additional power beyond that necessary to run the ship a waste. At which point what of the ship is left, and why not just build a new one?
The
Merchant's secondary hull has life-support, it's just turned off most of the time since the crew quarters are in the Orb section.
And I don't think the QM would put a trap-option of refitting a ship, only for us to need to design a completely new one after complications arise. Starfleet ships are usually pretty good at being refit to new purposes.