Shouldn't time increase with volume as well as complexity? And volume increases much faster than the linear steps in size code. Size code = days seems way too fast for larger sizes in your example.
I did say that was a fault in my proposal. Using the Size of an object is quick and easy way to figure out how long a build should take. Primarily it helps the Referee tell the Player "okay your object will take this many days".
Say you want to "make" a Size 7 tower block thirty floors high (this is actually the example used on the size benchmarks table).
As a Ref I'd say that it will take the maximum 12 days, assuming of course you have a gigantic Maker capable of building it in one go. This is a major point. In my previous rule suggestions in this thread i said a maker can produce an object half the Maker's volume. So in this case you'd need a maker twice the volume of our small skyscraper.
How about with "make" the tower in two story sections that are Size 6 in a Maker of the kind that usually builds Size 6 vehicles. We need to build fifteen modules that each take (Size 6= 6 +/-5) 1 to 11 days. So the whole project takes 15 to 165 days plus reasonable construction or assembly time and a small construction crew or robot cranes.
And at the end of that process what you get is an unfurnished shell, thats plumbed, wired and glazed but not furnished or ready to walk into and use.
I'm actually surprised that this works out reasonably. I'm sure we could come up with examples of large structure (smallcraft jump to mind) that could still be built in unreasonable times using Size = Days, but I'd expect the Ref to step in and rule it takes longer.
Rather then huge rules overhead, that's why I let the credit cost of the thing dictate complexity.
A FGMP is 100-1000x more complex then an ACR, let that be your guide.
I am trying to keep it simple.
Size = Days +/- Flux isn't a huge rules overhead in my opinion.
Lets have a look at how your suggestion for adding complexity might work.
Say an ACR Cr1500 and a PGMP is Cr10,000 so roughly x10 more complex. Say they're both around Size 4, so the ACR take 4 days and the PGMP takes 40 days?
Doesn't really hit the spot for me I think, but you might be pointing me in the right direction.