Mine is similar to that with the battery in front of the air cleaner, but the power steering was moved by the previous owner to be close to the radiator, held by a new bracket, not where it is in the pic above near the engine.
The dual battery isolator is screwed to the front inside panel next to the radiator. The cable to connect it to the 1st battery runs across the top of the radiator. The jack is in the boot.
The result is quite a tight space for the 2nd battery, but I was able to get a 100amp battery in there with a bit of fiddling. I had to cut down a plastic battery tray to make it fit.
So it is doable, with some fiddling.
