Offtopic:
Oh, momma, can I really get the same sort of critics when I upload my scores? :cool: Should consider posting them.
To the topic:
Generally, it sounds fine. Reading that you actually didn't care if a real orchestra can play it, I have to mention that you shouldn't really care -- as long as you do not intend your work to be played by a real orchestra. I just want to encourage you in case you want to go the way of creating new sounds of existing instruments. Even if they cannot really produce them, a computer still can. Go on, experiment, if that's the way you feel.