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QCRender, PBuffer, and Cameras, oh my!

I'm trying to create a simple live video DJ application. Basically, it take 4 inputs from 4 cameras, and allows me to switch between them (nothing special). I have the quartz composer part done, but now I need to put it in an application.
Having never really worked with PBuffers or live cameras (I have messed around with QCRender), I need some help.

1) I'm using quartz composer to render the video to be displayed at 1024x768, with each of the 4 inputs showing below it at 256x192. My idea is to render this all in a viewport of 1024x960, and then crop it and put each section into a window, scaling the large video to also put a preview onto the controller screen. Is this the best way to do this, and how do I go about the cropping and embedding?

2) I know that uncompressed video takes up a lot of space over firewire. For 4 cameras that send video at an unknown size (I think they'll be analog, so they'll be through component cables), what do I need to do to make sure that I can get all the various streams without delay and at at least 1024x768? Is there anything I can use (some sort of hardware) so that I don't have to potentially buy an extra firewire card for my computer? Or will this not be a problem??

3) I want to have some way of creating a table in the application that you can put data in, that will be sent to the quartz composition for use whilst rendering. I need it to be able to reorder the rows, but other than that I just need to be able to send all the data in multidimensional arrays. I know of the Chart application from the examples, but how do I enable reordering?

4) The video input patch in quartz composer has that wonderful input selection tool, but how do I get that in my application? Once again, I know there's an example of it, but I can't make heads or tails of how it's worth. If someone can give me a prod in the right direction on this, I can probably take it from there.

As always, thanks for any and all of your help.

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