Well, first off, the "kitness" aspect is way off on the decision horizon. Far enough off that I probably shouldn't have mentioned it....so please look at this light sir. PAFF!!!
Running two separate BBDs with different clocking invites heterodyning and extra noise from the way the different HF clocks interact. Puretube/Ton and others assure that this CAN be overcome (and the Boss DimensionC shows this to be true), but not without a more complex design and higher parts count. Running MORE than 2 or 3 clocks is likely to be quite problematic, unless you felt like making a big board for a rackmount kind of thing.
The "problem" is that BBDs tend to be multiples of each other in terms of storage: 128, 256, 512, 1024, 2048, 4096 stages, etc. That means you can't drive them from a single clock without experiencing annoying resonances. The MN3011 and MN3214 provide taps that are NOT multiples of each other, so they avoid problems with highly resonant feedback.
Well, let me qualify that. If you were ONLY using feedforward and simply feeding the outputs of, say 256, 512, 768 (a 512 and 256 in series), and 1024 stages to alternate outputs, using the same clock to drive them all, perhaps you wouldn't have that big a problem with noise...assuming NO regeneration/feedback is involved. Indeed, if you could get your hands on a bunch of 128-stage chips (MN3006), and create different delay times by placing a few in series, you could actually make something pretty lush in stereo. Again, this assumes you aren't using and regeneration that might cause resonances to emerge. I might point out that the MN3006 has a much higher dynamic range than most other BBDs, so maybe there is something to digging around for a stash of these.
Another route to consider is to check out the full-bandwidth all-pass filters that STM came up with in previous threads regarding through-zero flanging. These provide fixed group delays and there is no clocking involved, hence no heterodyning to be concerned with. So, a handful of MN3006's, some assignable group delay allpass filters and you may be able to accomplish an MN3011's task without an MN3011.
That sort of gives you an idea of why analog implementations of things like the STD-1 disappeared off the face of the earth once production of the MN3011 stopped, doesn't it?
