Variety Cryptic Crossword: Mystery Box 

Crossword: Mystery Box by Hex
I solve a variety cryptic crossword with help from the live chat on Twitch.
Instructions:
To find out what's in the central box, solve the
set of Box clues (a-h) and determine where their
answers belong in the diagram, using the Acrosses
and Downs as guides. Each square of the central
box has two of these 5-letter Box words abutting
it; for example, the lower-right square is
abutted by 21 Across and 24 Down. Every such pair
of Box words will combine to suggest a single
letter, and the central box's four resulting
letters will spell a word. Clue answers include
eleven capitalized words.