You can get most of his designs as short kits from:

Airspan is made by Solartex. It is unsealed and I use a product called Inkaid, applied to it, to allow printing on a desktop printer.

It's available under a different name in the US as "LW Tissue" from:

Not sure if the dirty remark was aimed at me , but the airplane is weathered and dirtied up, it just doesn't show up very well in the photos taken outside. It's subtle, but the overall impact is obvious.

I start with a thinned application of dark acrylic paint, glazing liquid, and water. I just slop it on. This is actually more to accentuate the details than weathering. It gets a good wiping, leaving the mixture in the cracks and crevices. I leave it a little heavier around normally dirtier areas, like the engine and belly. I then use the same mixture (thinned heavily and toned a little for color change), to apply runs and streaks at places they would naturally occur. Lastly, I use pastel colors to add smudges and general dirt from ground handling. This is done using my fingers. since all of my planes are electric, I don't need to seal anything, which is great because sealing the weathering tends to make it all look homogeneous and unrealistic.