How long is a piece of string?
It depends on your financial position, your free time and competence level.
YRM do complete inner wings for about £70 a side. Normally yu will find that battery trays, headlight boxes and bulkhead/ floor may well have gone as well.
I have done one side, no problem, but time constraints and lack of experience have meant two years later, I haven't done the other side.
But then others have "done" both inner wings in a weekend.