DC Window

dsarchs

I made a dynamic window component in an attempt to learn what goes into them. This window is based on the Milgard picture window profile. It seems to work just fine -- feel free to use it. I did have a couple of questions, though, if anyone can help answer them. (By the way, the material on the glass is for use as a bump in renderings [KT] to give the reflection just a hint of waviness).

I would like to be able to scale the size of the window as well as just entering sizes. I understand how to do either but not both. Entering data seems to require that you have set variables while scaling requires... grayed-out variables. I thought I might be able to do this through proxy/referenced variables but haven't given it enough thought to know if that will work. Any ideas?
I want to add mullions to the window could be resized and repositioned inside the window. I'm more sure that I can do this but haven't gotten around to it yet. Can you make a scalable array (of mullions) inside the window while the window proper does not use the scale tool to resize?
Would it be possible to (completely apart from this component) draw a plane over the window opening and replace that plane with this component already sized correctly? This seems like it would be easier for using in modeling. ...or is this something for a ruby rather than a DC?
Can you set limits on user input? For example, if x<12 then x=12?

LINK

For some reason attaching the SKP doesn't seem to work.

Lastly -- SU DC seem really poorly implemented and awkward. I was really hoping they would be easier and more powerful -- like a 3d version of AutoCAD dynamic blocks. At least taking advantage of stretching rather than needing to have every piece in a separate group getting moved around. It seems to add a lot of time building DCs and makes their organization pretty ungainly. I'm glad there's something now, though.

As I said earlier, this is my first DC and I'm just learning the basics, so any feedback would be greatly appreciated.