board design help

this is what i am looking to shape a board in the high 6’ range that is shaped sortof like a traditional longboard with the nose pulled in slightly, square (or rounded square tail), hard rails in the rear third, no concaves, around 3" thick and with a big greenough paddlefin. any comments? suggestions on dimensions? i am 6’2" – 185 – surf a bunch of boards (mostly long) in a bunch of conditions – i want this to be the first board i shape this fall. thanks.