I would also possibly be interested in a cheaper kit sans seat. I have a feel the included seat will prove to be too small for me (I am a big critter 6'4" 400 pounds) and was planning to use the seat from an office chair on mine
nerys, use the seat as is. The pressure intensity will be about 8 times less than your current saddle, and more as you recline the seatback - why stress over that? Just get it done I say.