Twine Install into 90 series Prado

Guys,

Have just purchased the Twine shower and looking to install it in the car..

Perhaps I should have taken notice when the ARB guys said "thats 300-400 dollars to install because it's ableepof a job...) - they reckon it would take all day..

Has anyone done this? - I guess as soon as you start adding extras under the bonnet (I already have a dual battery - second batt on passenger side between fuse box and firewall), everyone's config becomes different.

I have 'some' room on the drivers side behind the air filter, but I am yet to get a snorkel and I reckon that will need 'that space'.

Here's the questions then...

1. Heat exchanger looks like it will fit very nicely across the top of the firewall above the engine - not sure why the ARB guys said 'behind' the engine (like it was difficult) - am I missing the point here?? - Also, can anyone tell me if I'm safe to put a drill through here - I did read somewhere about issues with 80 series and brake lines....

2. There are two heater hoses entering the firewall very close to each other - can anyone tell me whether the inlet (flowing into cabin space) is the drivers side or passenger side (save some investigation)

3. I'm also pondering mounting the (shurflo) pump on the inside of the bull bar - any reasons I might not want to do that?? - am sure I've picked up that others are doing this...

Any other hints, pics etc gratefully accepted!!!

Regards

Ivan

(90 series GXL V6)

p.s. Apologies for crossposts (LCoolACT , 90sCOOL_AUS, 90series and Exploroz... Long weekend is good for me to install, but my chance of a response is low with everyone away - clutching at straws!! If I get 'good oil', on other lists I'll post it back here 'for the record'