Script on running MSBuild via PowerShell. This ties up neatly with my previous post.

$msbuild = "C:\Windows\Microsoft.Net\Framework\v4.0.30319\MSBuild.exe"
$MsBuilExists = Test-Path $msbuild
If ($MsBuilExists -ne $true) {write-host "msbuild does not exist at this location. Install Visual Studio 2015 (Community Edition should be adequate)"}
$buildFile = $PSScriptRoot+"\BuildAllDBProjects.targets.xml"
& $msbuild $buildFile