Lifting Bodies and Swing Wings

>From on-line searches, I've found lifting bodies like the M2F3 [1]
have less than stellar low speed handling. For the spacecraft designer
with a healthy mass budget, pop-out wings (hidden during re-entry)
seem like a reasonable solution. Two questions regarding this idea:

1) Does the M2F3 lifting body configuration have high drag at subsonic
speeds? I know it went supersonic during testing, but that could be
indicative of high thrust, not low drag.

2) If the pop-out wings were designed for best low-speed (landing)
performance, and the lifting body had a landing mass of 15 tons, what
would a reasonable wing mass be? 500kg? 1000kg? 3000kg?

[1] http://www.astronautix.com/craft/m2f3.htm

Mike Miller, Materials Engineer