Put this in my member build but thought I'd throw it in here for those that are interested.
So the last few days have been pretty busy. Fitted a second battery tray from Air On Board (ebay - $155) which is made for a Exide LCS27-97 battery, which is a 97AH deep cycle available from Anaconda (on special got it for $185)
The Projecta IDC25 DC-DC charger is also from eBay, including 2x midi fuse holders and 2x 40A fuses, was $299 delivered, which is an absolute bargain I reckon.
Quality of the battery tray is good, battery charger even better. Ran 8B&S cabling throughout as per recommendation in the instruction manual. That'll be the same size I get down to the tray.
Having read all the information contained on this forum, I took some good lessons out of it, namely to install the battery controller on the bracket before installation in the car, as there is very VERY little room in the car after it's installed. So that's what I did. The battery tray comes as two parts, and you bolt the battery charger bracket to the tray, then install everything after that. Will see how it goes with the heat from the engine bay but I'm happy with where it is for now.
The battery tray is bolted down in 4 locations, and can be a bit confusing to start with. One of the bolts (passenger side front) is threaded through a captive nut in the wheel arch. The Drivers side front feeds through a pre-existing hole in the arch and is washered and nutted from underneath. The Driver's side rear feeds through and it washered and nutted from underneath as well, but I installed two washers between the tray and the wheel arch to level it out a bit more. Then after those three are installed, you drill through the wheel arch and install the rear passenger side bolt through the arch with a washer and nut from underneath. Pretty easy overall.
Then you remove the plastic clips on the passenger side bonnet lip, and mark where the slit in the plastic is and drill 2x 9mm holes in the guard, before installing nutserts in there. These are then used to hold the support bracket with M6 bolts, before everything is reinstalled and secured.
The battery was an absolute nightmare to squeeze in, but it does go. Remove the accessory fuse box, the lid off the factory fuse box and pre-bend the wiring on the firewall to accommodate the battery. Slide it in, with much swearing, then bolt it down.
Positives were installed with the supplied 40A Midi Fuses, grounds bolted onto the factory one behind the accessory fuse box. I left the ignition wire open and it appears to be working fine, charging and isolating as it should. Any questions feel free to ask!