Am I crazy...custom PrPMC-PMC carrier board?

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I am new to the PMC (PCI Mezzanine Card)world, and have spent the last
few days coming up to speed on PCI, the different form factors, and how
everything plays together in hopes of utilizing in an embedded system I
am working on.

I am interested in utilizing a PrPMC board (like one of the many
PowerPC-based boards out there) as the main controller in a small
embedded system.  In addition to this, I would like to be able to add
in a few peripheral PMC boards (such as those sold at to add peripherals as needed.  Normally, this would
be reasonably straight forward: purchase the PrPMC controller which
would act as the main system controller (PCI Monarch), purchase the
add-on PMC boards (Compact Flash interface/whatever), slap them into a
carrier board and presto: instant system...

...except for the fact that I don't want to use a standard carrier
board like those that plug into a VMEbus.  I would like to develop a
carrier board that would essentially let me stack PMC boards on top of
each other (sandwich them) instead of running them side-by-side which
seems to be the way everyone does it.  This would then provide a
stand-alone configurable embedded system (no rack, just the boards and
the required power supply on the middle board).  At minimum, I would
like my carrier board to accept one PrPMC module, and one other PMC
module.  If more than two board were needed, then I would consider
going side by side (unless there is a way to stack 3+ boards up...maybe
some fancy, hinged connector that ran the PCI bus through ribbon

I can certainly envision this setup, so here is my question: am I
crazy?  Is there something I am inherently missing that disallows this
scenario from working?  My background is embedded systems, and this is
my first crack at diving into this topology.  It seems like if you had
such a carrier board it would be a very nice way to integrate and build
a high capability, stand-alone embedded system...unless I am missing
something here...

If you made it this far, I appreciate it.  I'd welcome any feedback and
would be happy to provide any additional details if needed.

John O

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