I've been doing some work with Zero Touch Installation lately and have certainly come across my fair share of problems. Fortunately you can get a lot of debugging information out of ZTI. THere is a great article OSD and ZTI Troubleshooting Tips that has some excellent tips on debugging.

One thing that I found that caused me grief for at least a few hours was the 80004005 error. According to the article mention above the causes are commonly:
-Wrong PackageID in customsettings.ini
-Failure to resolve MP or DP using FQDN
-Missing NIC drivers in Winpe

I found that I got this error because osd.debug existed on the machine I was testing on. If you're testing your deployment CD's make sure you do a diskpart first or at least remove osd.debug.