Question time # 58 resolved.

FINALLY. Thank you Anonymous Barry. ZK-SDI was what we have been waiting for.
Above is the RV-4 ZK-SIM2 c/n 2816 as spied at Wigram on 06-05-2008.
Below is the Stolp Starduster SA100 ZK-SDI c/n 14 at Rangiora 0n 21-11-2007.