I have been using Advanced Composites Group's VTF261 for almost all of my Pre-preg parts surface material. I also use some material from SHD but that is for backing up the part as it is quite a bit cheaper than VTF.  So after a chat with some of the guys at PRF I decided to try their PRF 464 material this week...  I only got the part out of the mould last night so sorry for the poor photos but it is actually a very good product and although there is some pin holes on the surface it is more due to the breather stack we think than the material. I laid it up like I would with VTF but we think it has to have a perforated release film not the non perf I have been having the best results with VTF.  

Again sorry for the poor camera phone photos I took last night.

It is not 25 layers thick... It has some core in between the mounts and has been built up with about 30-40 small strips wrapped round the inserts and then off along the sides with a full layer along the structural section after several layers have been built up round those inserts. It was more about getting enough direction changes in the weave to spread the load through the seat unit. It is more than strong enough with around 10 to 12 layers which fully encapsulate the seating area. The area behind the seat is only 2 layers thick in the open areas and 3 to 4 layers along the seams and a reinforced T section over the hump. I got advice from a guy who has been doing this for 30 years and even at 900grams he said it was heavier than he would have made but it is better to be heavier than weak.. lol..