This can be done fairly easily using property nodes.
Property nodes set to read the VI properties can give you front panel size and position, and you can also set them to whatever you want.
So you just need to get a VI reference (Functions Palette>Application Control>Open VI Reference) to the VIs you want position, then use property nodes (Functions Palette>Application Control>Property Node) to read and set the size or position as needed.
Open the Example Finder and navigate to "Programmatically Controlling VIs>Controlling Front Panel Objects and double click VI Server - Changing Another VI's Properties.vi. This will open an example VI that shows the basics of how to use property nodes to move things around.
Just be sure to close all the refer
ences you open.
Ed