I’ve produced two small custom LEGO kits for Hebden Bridge-based Calrec Audio recently. The first was a 208-piece version of their Type R audio console. The second was a 68-piece version of their Argo S audio mixing control platform. Both involved a heavy amount of custom printing to really get across some of the detail of the consoles that were not possible to do with LEGO piece at this scale.
The custom kits were given away to promote their products, and have been really well received!