I'm happy to report back that the install went great.
Some things to note:
I was led to believe that I needed to buy the PAC PGHFD1A wire harness (~$8) to retain the use of the LCD display. It turns out that this was included in the iSimple ISFD11. While everything I found online showed that this was "Sold separately", turns out that wasn't the case. I submitted it for RMA at amazon. Even if I couldn't get a refund on it, i'm not going to sweat 8 dollars.
OK. On to the install notes.
First off, I would highly recommend Twinkeethekid's post on how to remove the factory radio. I followed everything word for word and it worked perfectly. His post can be found here:
http://www.focusfanatics.com/forum/showthread.php?t=147694
When hooking up the modules, be sure to follow the directions when it states that you must have the SCC1 sirius tuner connected to the iSimple module before hooking it up to your car. I missed this step and simply wired it up in whatever order was convenient for me. This resulted in the satellite radio working but not displaying any info. It simply stated "Acquiring text" or something of the sort. Unplugging the modules, waiting 1 min, and plugging them back in solved this.
As far as where to mount the modules:
I mounted them both inside the passenger side dash behind the APIM (the black box behind the passenger side trim piece. It required some awkward reaching (from the glove box reaching up) to mount them properly, but it worked out. I mounted them with outdoor 3M mounting tape (rated at something like 6lbs/sq in, as opposed to the normal 3M mounting tape that's rated at 2lbs/sq in - the regular stuff kept dropping the modules).
For the antenna:
I mounted the antenna on the trunk lid. I'd like to get a look at someone's antenna with factory satellite radio installed to see what the antenna looks like. I removed mine (removing the headliner to get at it is a royal b[

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]*, so please take my word for it) and disassembled it. It has no satellite antenna inside it, but perhaps room for one to be added. The standard SIRIUS antenna that comes with the SCC1 does not fit in the housing.
From there it was simply routing the antenna cable carefully behind trim pieces, down the passenger door sills and up into the glove box area.
Sorry I couldn't post pictures - I had a last minute change of plans where I did the install, and had no camera available. I know this post is lengthy, but I hope I covered what you need.
Thanks,
Tim