Excellent build, Gary! I like your extra detailing, you have really done a great job with a venerable kit.
You're right, this kit represented a new level of quality for both Monogram and the hobby at the time it was release. I think it still holds up today. I've built Eduard's P-39, too, and if nothing else, it reminds me of Monogram's kit, in that the kit has a nice level of detail and you can build a good representation of the subject, out of the box, or go nuts and super-detail it, a la Shep's "Tips on Building Dioramas".
Yes, very nice job!