I know L/R parts are interchangeable but I have a series 2a military rolling chassis (solid) panels good and off the vehicle and have been offered a series 3 (chassis rotten ) otherwise all else good are most of the bits a straight forward swap I want the series 2a to retain its look (dash,wings etc ) but my springs, swivels, tyres have had it thought it may be better to swap them over etc just not sure how much of the series 3 i could use