Interesting aero-space plane concept, might want to chamfer in that intake a bit though near the wing root, else you might get some nasty airflow effects, especially a high super or hypersonic speeds, which I assume you are going for.
That YF-17A Viper looks wrong on so many levels. If I might make a suggestion, instead of just giving in an F-110, give it the whole F-16 back end, otherwise your horizontal stabs won't have any room for their mounting and servoes, also, it will give you the F-16 airbrakes are the same time.
Posts
http://www.secretprojects.co.uk/forum/index.php/topic,1848.msg46701.html#msg46701 i based work off of there ruffs