I followed this guide for my lab build. I was getting pretty frustrated with failures. It turned out my initial extraction of "SCConfigMgr07_EVAL_EN.exe" was corrupt. After I re extracted and ran the setup locally it worked fine.
Great guide.
Thank You!
My lab environment
2003 AD
DL 380 G3 4GB RAM /2003 Server running VMware Server
VM Running 2008 Server SP2, SQL 2008R2 & SCCM