Hi Rickard
May I add my welcome too -it is great to see a new build appear, and I'm sure you will develop a strong following as you progress.
There is at least one other e39 Sportster build on the go - he is "Well North" too - somewhere around Aberdeen!. His name is Cameron Mitchell - on here as "Cammy". He started his project with an M52TU engine, but after some hard won advice from other builders elected to go with the same engine as yourself - the M52B28.
Cameron's blog is here:
http://www.madabout-kitcars.com/foru...ighlight=Cammy
From what Cameron has described, the kit sounds very good, making use of the entire e39 rear sub frame which is secured with just 4 bolts - so easy. Installing the engine is bit more tricky though - you'll see we've all had our head scratching moments over getting it aligned in the chassis/bonnet!
(- mine is a Cabrio, but has essentially the same steel chassis from which the Sportster was developed)
Good luck, and keep posting photos of your progress.
Mike