Where exactly is the site that you propose above. Can you be more explicit as to its exact location and if there will be much in the way of difficult infrastructural works involved ? In that case, what do propose will happen to the existing Gatley station on the Styal line ?
Are you aware of the Baguley station location to which I alluded in my earlier posting and its proximity to the Manchester Metrolink Airport extension line ?
There is a derelict mansion at the south-east of the M60/A34 crossing. I would have put the station complex and parking on that site, such that the ticket office and main entrance would be as close as possible to the point where the lines cross, so there's minimal horizontal distance between the platforms on each line.
I think I need to invest in some OS maps.