Dutton Legerra back axel problem

[COYB]

Anybody here got a Dutton Legerra?I recently bought one which needs a bit of work.One of the problems I've got is that the rear springs catch on the top trailing arm mounting and the angle of the shocker seems all wrong.The back axel tilts up at the front where it looks like it should sit level and creates quite an angle for the prop. to drive throuhg.Also the rear wheels sit way back in the arches and look like they need moving forward.I'm concidering shortening (maybe 20mm) the two upper trailing arms which I reckon would sort alot of this out.I realise I might have to shorten the prob , but I've done it before .Any advice is much appreciated, especially if this is not the way to go about it.Cheers.