Ok well I love watermelon so I did some research to find an extract version of a watermelon beer, no luck so I found out how to convert from AG to Extract... Hopefully I did it right.
I used this to help me with the conversions.
First my basic numbers:
Wheat needed in DME = 2.4 lbs
2-Row needed in DME = 1.7 lbs
Honey Malt I was told that you could steep it or do a mini/partial mash of it.
Honey, same as orginal recipe = 2 lbs
What I came up with some more research... Can't just buy pure wheat extract...
Basic 65% Wheat/35% Barley Dry Malt Extract was used to get wheat.
3.7 lbs of a 65/35 mix to provide the wheat extract. This provides 1.3 lbs of 2-row (told it was barley in the IRC room)
So you need more 2-row to fill the grain bill, at .4 lbs of a light Dry Malt Extract, or some sort of extract that is a 2-row substitute. I was doing my research of this and found it to be suitable, but then told that not everyone does it this way so check it before you buy it.
Now for those of you who don't care how I got everything I'll provide a quick rundown of what is needed now.
Extract version of B's Honey Wheat (added watermelon juice to make it watermelon)
3.7 lbs Wheat DME (65/35 mix)
0.4 lbs Light DME (or suitable replacement for a 2-row/barley DME)
2.0 lbs Honey
0.25 lbs Honey Malt (either steep or mini/partial mash)
Continue with the rest of the recipe and hope it works out for you.