info on how to air ride my t25

The rears are easy, just cut the spring mounting nipples off, make some bag mount plates and bolt a bag in place. The dampers can stay as they are.

There isn't enough room up front, nor enough travel in the suspension without cutting out half of the seat base to allow the wishbone to move up another few inches for it to look anywhere near properly low. The largest bag you can fit is too small of a diameter to give a firm enough spring rate at a reasonable ride height, so on the move it'll have to be pumped up quite high.

On top of all that, you need to relocate the dampers somehow as now your air bag is in the way (The Aero sport "hollow" bags won't work in this application because the spring platforms don't stay parallel or even in the same plane over the suspension travel).

You'll need a very small damper with a very high damping rate to make it drive right, so you'll need to get something custom made.

A friend and I fitted bags to his van, it took some serious surgery up front. We're talking roughly a weeks work to get bags to fit without rubbing (much!) and gain an extra 3" of suspension travel. After all that, If truth be told, it doesn't look that low, because the tyres hit the front wheel arch tubs so you only tuck an inch or so at most, coincidentally this is the height at which the steering arms foul the chassis rails.
There's no way round this without cutting the flipping doors up, raising the seats and either relocating the steering rack or cutting more lumps out of the chassis.

All in all, T25s are not built to go low without completely re-engineering the whole front end!

Even with importing stuff himself and using £8 chinese ebay valves, free pipe and fittings he got from work etc etc, I don't think he had change from £1300.