I thought long and hard and researched this idea to see how hard it would be. The replies from searching various forums and speaking to sellers of such swivel seats ranged from "undo a few bolts mate" to " a certain ammount of engineering is required but not beyond the realms of a DIY person". Well I located a swivel base made by FASP. and when it arrived it looked quite straight forward. I had already previously taken the front seat out when I changed the leisure battery so therefore knew that bit would not be to difficult.
Having got the seat out this is where the problems really began. Problem 1 meant that when the swivel was attached to the base the seat would not go back on because the runners would not fit due to the locating lugs being at the front had been raised.
I was prepared for this problem as it had been mentioned before whilst doing a bit of research. I therefore had to saw the lugs off. The seat then bolted through the swivel plate and back on to the frame.
The next problem I encountered was having put the seat back in to the van, teh seat would swivel nicely to face the rear of the van but when back into the driving position the seat was slightly offset. Meaning i would be driving without the seat being straight. I looked and looked for advice on this and even phoned the manufacturers for advice. When the seat was swivelled to the driving position it was catching on part of the swivel. The answer Iwas told was that I would have to modify the seat swivel itself. I therefore had to saw and grind a lug off of the swivel base so it would swivel all the way back round to its driving position and be sraight. The second picture shows the lug that I had to grind off. Once done the seat swivelled around and back in to place and locked firmly.
The other pictures show the seat swivelled and the extra space it created. There was loads more space inside the van. It had proved to be quite an investment. The job took me about a whole day but if I had known from the start what I had to do I could probably have done it in a few hours. Im well impressed by the extra space created and more than happy with the end result. The only problem now is that instead of the boys sitting where they normaly sit, they now both want to argue about who is sitting in the swivel seat!!
CAUTION
Replacing the seat unit with a swivel seat is not something to be done lightly. Where possible you should always seek expert advice. Make sure that you only use high tensile bolts to bolt the seat, because in an accident there will be a lot of stress placed on the bolts. This is a job for a competent DIY person to undertake if you don't feel competent then I would not hesitate to get someone in that is.
Another thing to bear in mind is that there are loads and loads of different variations of seat fittings in the ducato and boxer vans. Therefore it might simply be a case of bolt on bolt off, but the likely hood is that it wont be. The instructions sold with these products are at best inadequate due to the ammount of variations. I found this video very helpful. http://www.youtube.com/watch?v=Ace68J3oknM But even with this video mine was slightly different.
Good luck and if you require any help please email me.