Re SBS.....I have one too and am planning to use a lite weight non woven fusible interfacing.....sewing it onto a rough cut piece of fusible right sides facing, using 3/8"seam allowance...or very scant 1/4",cut fusible same shape as fabric piece .....believe me easier to do after sewn onto it, cut slit into center of fusible,flip out and with invisible thread tiny zigzag onto background... But, with each completed work layer...hand, arm, body.....cut out excess from back.......build from top layer to bottom layer.....not hard but time consuming....just the way I do it.....