What is a magic builder?

Presumably, a skilled technician who constructs apparatus to be used by a "magician" on stage as part of a magic act.

magic=illusions

http://www.google.ca/#hl=en&sugexp=les%3B&gs_nf=3&gs_rn=0&gs_ri=hp&cp=17&gs_id=1w&xhr=t&q=magic+builder+jib&pf=p&tbo=d&sclient=psy-ab&oq=magic+builder+jib&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=c5672f593531bfe2&bpcl=39650382&biw=1373&bih=780

I wonder if the question "What is a magic builder in this sentence?" might be rewritten ""What is "a magic builder" in this sentence?" and be answered "an idefinite article followed by a noun phrase". Just wondering, especially since the definition of a "magic builder" is clearly set out in the sentence quoted.