What is the probability that a designer would be interested in this little backwater world on the outer arm of a rather insignificant galaxy?
I don't have the foggiest idea - and neither do you or anyone else
Perhaps we are part of some sort of weapons development project and our isolated location away from prying tricorders is a big attraction. Then again I could have watched too much
Star Trek.
It's certainly not the center of the universe eh? Certainly there is no major "universety" nearby for aspiring designers to have their abilities improved, honed and tested ... refined.
Maybe, maybe not. It would seem that if our designers/implementers can get from wherever they hang out to here they are capable of travelling at least inter-stellar distances (if we're going the alien ID route) - in which case 'nearby' may not be a meaningful concept.
Maybe I'm not getting my real point across very well.
Personally I think that ID as currently espoused has little to no scientific validity and is ultimately just a political and/or religious movement to get around the separation of Church and State in the US.
However it seems to me the sort of arguments you are advancing rely on a level of knowledge of the goals of the putative IDer that simply isn't available and as such don't hold too much water.
I wish I didn't know now what I didn't know then