Thanks. I've been "trying on" the idea of (sometime) doing a scratch-built 1/4 DrI and have blown up some scans of the Ian Stairs drawings to the size of the GTM cowl. The pots I usually use for cowls are perhaps a bit too flat-faced for the DrI so basing the build on GTM cowl would seem like a smart idea. Looks like 7" wheels are also about right. I had initially considered working off Achim Engel's plans for his full-scale replica but those drawings are apparently no longer for sale.