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I should add, it seems to be working really well with the Mamba (TD05H copy) 16G/6cm I've just fitted.
Hitting 22 psi easily with not too much induction noise

Cheers Mark, I'm still not interested in making one for someone else :)

You'd be surprised how simple it is if you buy a filter, grab some cardboard and ducting tape and get to work with the...

Yes, certainly. The added strip was easier for me to do than bending

Here's the inside of the lid
...

For the dimensions, I'm not sure it's a good idea to copy this sort of thing exactly.
It took me 10 mins to make the cardboard mock up but I trimmed it a fair bit with scissors to make it fit right....

From a different angle
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The 1.6mm edge of the lower half has a 3mm flat bar border welded around it so the filter is effectively sitting on a 4.6mm edge.
...

Finally got the 4" elbow through the inner guard. Tried to do it all from the engine side but you can't do a neat job without removing the mudguard.
It was easier than I'd thought to remove.
This...

If you look at the 2nd pic, you'll see one side of the box bent up. The angle iron swings up 90 degrees.
The press is holding the rest of the sheet firm while a side is bent up.
If you look...

Are you asking how it works?

I have a length of angle iron fixed to my press to work like a homemade panbrake.
I bent the small end in my vice. It's only 1.6mm same as exhaust pipe
...

Cheers Mark, yes I'm pretty happy with it now. There's nothing really hard to do in there if you have the time and can weld a bit.
The IC cradle is only 20mm square tube and some flat bar. The IC...

P4x4 member mytqik did it for me.

Well, looks like I just sold it :)

Mark, the main issue is that my vehicle is a bit unique with the steering pump on the left side and the TB45 A/C hoses running differently to a stock TD42T.
There's also an issue of battery tray...

I wouldn't bother, I'm enjoying my retirement doing stuff for myself..

Shhhhht, I'm trying to sell my old one :)

I was previously using the stock GU TD42 airbox with the cobra head mod and 3" pipe down to turbo into 2.5" reduction.
I still have the stock HT18 turbo so wasn't expecting to feel much, if any,...

The fact that I drink diet coke? :)

As I mentioned above, metal sheet from Bunnings and 4" mandrel bends from Ebay..

I've just made my own flat panel airbox with 4" in/out and thought it might interest some of you.
For space reasons I chose the Ryco A360 air filter. This is standard on some old VN & VS Commodores...