short quick procedure for building custom iso image esx5 .
First download the offline esxi5 depo file from vmware and then in powercli :
Add-EsxSoftwareDepot -DepotUrl C:\esx-depot-5.0.0-469512\VMware-ESXi-5.0.0-469512-depot.zip
New-EsxImageProfile -CloneProfile ESXi-5.0.0-469512-standard -Name “Esxi5-469512-hp-cisco”
Add-EsxSoftwareDepot -DepotUrl C:\esx-depot-5.0.0-469512\HP-drivers.zip
Add-EsxSoftwareDepot -DepotUrl C:\esx-depot-5.0.0-469512\CISCO-drivers.zip
Add-EsxSoftwarePackage -ImageProfile “Esxi5-469512-hp-cisco” -SoftwarePackage hp-driver
Add-EsxSoftwarePackage -ImageProfile “Esxi5-469512-hp-cisco” -SoftwarePackage Cisco-driver
## double checking if all is inside our new custom cisco/hp iso
(Get-EsxImageProfile -Name “Esxi5-469512-hp-cisco”).VibList
Export-ESXImageProfile -ExportTo-Iso -ImageProfile “Esxi5-469512-hp-cisco” -FilePath “c:\my_custom_cd.iso” -Force -NoSignatureCheck
and so on…