The original CFS2 Ju 87 by Steve Fairs used to be posted on his site over at Sim-Outhouse. Like Richie, I've never tried it.
I can't ever find an ATA passenger plane for download for any sim,
Sorry. Call me thick but I don't know what ATA stands for in this context. I believe the Air Transport Auxiliary used standard RAF types like the Anson & Fairchild Argus for transporting their ferry pilots.
PS. I had a quick search but Steve's page seems to have disappeared. Alphasim have a CFS2 Ju 87D in their freeware section.
http://mysite.wanadoo-members.co.uk/alphasim1/index.html