Nice work mate, although junk those horrid spesh forks and fit something like a nice Pike would you! (says the man who owns 3 sets of Maverick forks! 😉 )
Regarding my calculator, I think I should have sent you v8 now right? All you need to do is input your gear sizes and your wheel and tyre sizes into the calculator. Then your crank length, and your optimum cadence if you so desire too. In the yellow boxes (everything else is locked now anyway).
What you will then get is the equivalent gears… With an 18T on the back, as TJ says, you've got as close to dammit an 11-34T range on the back. So you've effectively got a 24/38 ring setup, with 11-34 on the back. In other words, you've got most of a normal 27speed setup, you're just missing a couple of gears off the top (44/11 and 44/12) really, otherwise you've got the lot! Not bad really…
BE CAREFUL running the Hammerschmidt in 1:1 too much of the time though. Alfine hubs were designed around a primary:secondary gear ratio of circa 1.6:1 or more… With your 24:18 yours is only 1.33:1, which is a bit low. I have heard of a couple of hubs being run with low ratios having stripped their clutches, but in fairness they were big lads cranking hard apparently…
How does it all feel when you're running the Hammerschmidt in Overdrive though? Do you notice the extra drag much with 2 gearboxes? Oh, and being cheeky, where are you based mate? Would love to get a go on it to see what the drivetrain is like all together!