From what I know, the preference is to cut the rust out and replace the metal, rather than plating. Rear cross members on these things are prime for rot - if you fix it properly once and keep it clean underneath, you should avert future major work.
Depends how bad the rust is, and if it has got into the chassis rail(s)
Worst comes to worst, you can strip the back end right to chassis in a day with a mate helping, and weld in a whole new cross member!
Big meccano sets these things. 
If there is rust in the fire wall, beware. Big job.
Welcome to aulro!
[B][I]Andrew[/I][/B]
[COLOR="YellowGreen"][U]1958 Series II SWB - "Gus"[/U][/COLOR]
[COLOR="DarkGreen"][U]1965 Series IIA Ambulance 113-896 - "Ambrose"[/U][/COLOR]
[COLOR="#DAA520"][U]1981 Mercedes 300D[/U][/COLOR]
[U]1995 Defender 110[/U]
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