RE-relocating the battery?

Being that my battery was relocated to the trunk before I obtained it, and I'm not wanting to wrestle with installing an external ignition switch just to meet NHRA tech specs, and a slew of other reasons, I'm considering the project of putting the battery back up front where it originally was located. I'm not terribly worried about changing handling characteristics, as I'm not doing any autocrossing with the car, nor is traction going to really change much - heck, I'll probably leave that current battery back there for dead weight, anyway (until I drop in a full-size spare tire), and install a proper Group 58 size battery up front, anyhow.

Trouble is, I have no battery tray left up front, I'm not sure where the ground cable originally was located on the front end, and I have no idea how I'm going to make the thing sit securely without flopping all around in there, short of employing some ugly and awkward metal strapping, or something like that.

It wouldn't be such a confusing issue if I'd been the one to do the relocation, myself, in the first place but, again, this was all hacked and bolted into place long before I got hold of it.

Oh, and a side-question: Would I be able to salvage the big ol' thick welding cable they used to put the battery in the trunk for use in doing the 3g alternator upgrade?

Reasons being:

1. I don't have anywhere to really mount the switch without it looking hideous and/or giving some joker a means of messing with my car in a parking lot. (Come outside after work to start the car, but some A-hole's shut off the battery, all my radio presets are gone, ECM has been reset, etc.) Unless there's some kit for sale that allows the switch to be behind the license plate - the one I've seen was, I think, a custom-made job - then there's not many options there;
2. I'd need to invest in a fancy-schmancy battery box and/or a bunch of sheetmetal to place behind the back seat to make it NHRA legal;
3. I'd only intend to keep the old battery in the back for weight until I can score a full-size spare tire, which would weigh *approximately* the same as the battery that I have. Soon as I have the spare in, the battery comes out;
4. The battery that's in there is aging enough that it's about due to be replaced, anyhow.

I know it sounds a bit dumb and odd - hey, I'm all about being dumb and odd, anyway - but I can't really justify the bodywork AND the cost when I can just rearrange what I've already got and be done with it.

So, aside from the main ground to the block and the pigtail to the chassis, the only other cable would be just a short jump from the battery's positive post to the starter solenoid, right? Cool beans. Now to see about rigging up some kinda tray for the battery to sit in, maybe using this groovy homemade aluminum half-box someone left for me in the battery core bin at work...