I don't know what size battery you have but anything S1 Ringmaster size or smaller you're going to have problems finding a place for the battery without making it nose heavy. One major concern is you have to keep the weight centered on the thrust line or it will fly really weird.
I guess this is a Brodak Clown that has the spars top and bottom?
What I would do is cut the motor mount off the front of the conversion kit and save it for later. Then cut the leading edge completely out and glue in the box back to the spars. The 4th side of the box would be the fuselage. Put a big gusset behind the leading edge to the box and put a shear web on the spars outboard of the box. Load the battery from the front.
Now don't forget you need the push rod on the inboard side so slide the fuselage on before you glue the box in place or you'll have to split the fuselage to get it on the wing.
Make a cut out in the nose for the motor and glue the mount you cut off to the back and put some gussets behind it. Then figure out your wiring and controller placement.
More than one way to do things. This is just something I came up with for a Sig Banshee I converted to electric. Good luck.
Motorman