I recently added adjustable seat rails in my Unique so that my daughter and I could both properly drive my car. For details of the seat rail installation go to
http://www.uniquecobra.com/topic.asp?TOPIC_ID=290 Unique trims the bottom of the dash on the driver’s side to give better leg/thigh clearance under the dash. I would guess that most kits could also use the bottom of the dash trimmed down. Like you, I added a 2" spacer under the front of the seat to angle it back. However, you may find that slightly less seat angle might be a good compromise for increased thigh clearance. Maybe it will take some experimentation of trimming the underside of the dash and the amount of front seat edge spacing. You might want to search "seat" on Uniquecobra.com for more seat modification. I have also been experimenting with improving lumbar support and the seat bottom cushioning.
Good luck and if you don't mind, report back how it is going.