Merge xslx files

Hi! I got a script for merge few xslx files in one, but I need much more abilities from that script, such as column width and worksheet name. I have tried to make it by myself, but I have no success. Please help
The code:
$Files = GCI ‘D:\Docs\Excel\Merge’ | ?{$_.Extension -Match “xlsx?”} | select -ExpandProperty FullName

#Launch Excel, and make it do as its told (supress confirmations)
$Excel = New-Object -ComObject Excel.Application
$Excel.Visible = $True
$Excel.DisplayAlerts = $False

#Open up a new workbook
$Dest = $Excel.Workbooks.Add()

#Loop through files, opening each, selecting the Used range, and only grabbing the first 6 columns of it. Then find next available row on the destination worksheet and paste the data
ForEach($File in $Files[0…4]){
$Source = $Excel.Workbooks.Open($File,$true,$true)
If(($Dest.ActiveSheet.UsedRange.Count -eq 1) -and ([String]::IsNullOrEmpty($Dest.ActiveSheet.Range(“A1”).Value2))){ #If there is only 1 used cell and it is blank select A1
[void]$source.ActiveSheet.Range(“A1”,“F$(($Source.ActiveSheet.UsedRange.Rows|Select -Last 1).Row)”).Copy()
}Else{ #If there is data go to the next empty row and select Column A
[void]$source.ActiveSheet.Range(“A2”,“F$(($Source.ActiveSheet.UsedRange.Rows|Select -Last 1).Row)”).Copy()
[void]$Dest.ActiveSheet.Range(“A$(($Dest.ActiveSheet.UsedRange.Rows|Select -last 1).row+1)”).Select()
$Dest.SaveAs(“D:\Licenses 2015.xlsx”,51)

check Doug Finke’s Excel Module