A simple way to create empty PSCustomObject with properties

PSCustomObject.ps1

[PSCustomObject]@{} | select-object q,w,e,r | gm

   TypeName: Selected.System.Management.Automation.PSCustomObject

Name        MemberType   Definition
----        ----------   ----------
Equals      Method       bool Equals(System.Object obj)
GetHashCode Method       int GetHashCode()
GetType     Method       type GetType()
ToString    Method       string ToString()
e           NoteProperty object e=null
q           NoteProperty object q=null
r           NoteProperty object r=null
w           NoteProperty object w=null