Yes, what I do is open pour the resin and the hardener into separate containers and then mix portions as needed. A mixed quart at a time seems to work pretty well. I TOTALLY CONCUR that this job it is far more difficult than laying normal tile. I could have easily laid normal floor tile in the entire salon in a couple of hours at most; I managed to get about 1/3 done in most of a day.
Re random cutting:
The easiest way to get the random cut look is to random- cut the first boards (including the 1/4 "holly") that start at a wall. Then, no more cutting is necessary for general laying because the random cut is established. True, the "random cut" is actually a repeating pattern but because each Amtico board is a different grain/coloration, the eye won't pick it up.
For truly random cut, a trick I came up with - probably been done before but I had never seen it - re the random pieces and placing them correctly is: Dry lay the floor - which you will have to do for a true random-cut. Then take some strips of masking tape and lay strips of tape about a foot or 18 inches apart across the floor. Do that in sections about 2 feet wide and a 3-4 feet long. You can then "roll up" the floor sections and easily lay it back down as it was when dry-laid. (I figured that out after our first attempt back in '05 where we tried numbering the pieces. FORGET THAT!)
Also, re the adhesive…as I have stated before, Amtico recommends the 2-part adhesive for moist areas and areas of wide temp spread. The boat seems to be a perfect example of that environment. However, I laid Amtico in the bow compartment in '07 using standard adhesive from the local hardware store and it has held up just as well as the rest of the boat that I did in 2-part in '05. I'm not recommending single part because Amtico doesn't, I'm just relaying a personal experience. THe reason I did that is because we had some Amtico left over from the other work (helm area, galley, passageway, heads) and we later decided we wanted it in the bow. So, rather than order the 2-part adhesive, I decided to try the normal stuff. So far, it's been fine. So that's a "FWIW" bit of info.
But I ordered the 2-part for the salon. However, if I ran a bit short, I wouldn't hesitate to finish using regular adhesive but I would ensure I used the two part in the areas of heavier traffic/potential heavy moisture and use the regular stuff against the side walls/other areas where there is no traffic. As I said, the bow compartment/regular adhesive has been fine and it sees a considerable bit of traffic and wet gear on occasion.