Sal,
I think Corduroy pretty much covered my opinions to the handle thickness issue, so I'll try to expand a bit more from my perspective.
I'm assuming the Chinook(which I haven't yet seen, drawing or otherwise) coming from James Keating will most likely be a fighter? If so, it's utilitarian characteristics can take a back seat to its main focus, blade combatives.
I (personally)can accept a certain degree of trade-off in carry convenience for 'maximized' defensive capabilities. A couple of examples of this could be:
The Gerber A-F(large) combat folder, thicker and longer than average folder.
The CS Vaquero Grande and probably the entire 5" blade line, much longer than average folders.
None of these seem to be ultra popular, but they are 'specialized' pieces for a specific function, and they do sell.
True, you could give the Chinook flat scales and probably appeal to the masses, but like Corduroy stated, Spyderco is known for having something for everyone, and there are plenty of high quality flat scaled Spydercos that could fit the Tac-utility role. The Chinook doesn't sound like it's for everybody, so why try when you know you've got a smaller, locked in market? which probably will match the (small)production volume nicely?
Don't get me wrong, after a certain thickness, it *will* be 'too' thick to carry, even with maximized defensive qualities. I'm not suggesting simply to radically built up more mass in the center of the scale, but to shave off or round off some mass at the outer edges, so in a way, not much mass/volume is added, just reshaped a bit.
But I don't even know what the Chinook looks like, or even if it's function is truly a pure martial bladecraft knife or not, so I'm going to apply this rounded handle suggestion to any other models in the future that 'do' have a pure martial intent as well.
That's gotta be more than ¢2
Thanks,
Ken