i was referring to the elbow and wrist ( i guess the uber large sprocket is your shoulder). if they are say 12 (driver) and 24 (driven) that'll give ya a 1:2 reduction. if space/time permits swap the 24 for a 28, 30, 36 etc... however large ya can cram in there and it will help lower the ratio and speed. no need to play with software. it'll also help by providing some more precision for the drivers. i personally prefer spacely sprockets over cogswell cogs.
oh yeah and dont forget some cool lexan on the sides of your tower - awesome real estate for sponsors and team info!