Upgrade from 4.0B to ECC 6.0

Hello Experts,

We are planning to hardware migration and upgrade from 4.0B to ECC6.0 system.

Existing system:
SAP: 4.0B
OS: HP-Unix/DB:Oracle 9i.

Target
SAP: ERP 6.0
OS: Windows /DB: Oracle

Our approach is like below

=======================

1) Hardware migration from SAP 4.0B [HP-Unix/DB:Oracle 9i]  to SAP 4.0B VMware [Windows/oracle]
2) Upgrade from SAP 4.0B to SAP 4.6C
3) Upgrade from SAP 4.6C to SAP 6.0

Please confirm whether above approach is feasible. or any other best approach please let me know.

Thanks
Thiru.