At the second picture it looks marvellous. New wing combined with not so dominant/visible air intakes (as they are at the first picture and also in real life) make an effect of a very progressive stealthy design.
What's the history on the F-15U proposal? I've seen drawings of an F-15 with butterfly tail; is this related?
Tailhook magazine reported several years ago that the Air Force had tested a stealthy F-15 that posed so much of a threat to the F-22 that it was literally buried in the desert. I take the report with a healthy grain of salt, as the Tailhook Society would be too eager to latch onto any rumor that made blue-suiters look bad.
There is a F-15 Silent Eagle that has been built by Boeing-McDonnald Douglas which is the spitting image of your model. The Silent Eagle is to entice current users away from the F-22, Eurofighter Typhoon and Super Hornet options as a follow-on aircraft using the latest stealth, composite and carbon fibre materials.
I hope this helps.