I've been doing this for 15 years, and it's real simple, a person using winisd isnt going to worry about applied power. a good box builder as you say would only use winisd for a basic normal build. your not going to use winisd when designing a box like the one in my yukon. your not going to use it when designing a wall. there's too many varibles when building those types. so once again he's asking about winisd not bass box or bass box pro. winisd is a great program for normal non power insane builds. but your 5 years trumps my 15 years. i guess i'll turn all my customers to you from now on. i guess all my usaci wins and state records were flukes. man i wish i knew then that i was building boxes wrong