Agreed right up to the brigade numbers.
As between the RegF and ResF there are enough authorized personnel at present to grow five manoeuvre brigades and three support brigades.
If one uses just the equipment we have as a 'come as you are affair' then the manoeuvre brigades could be:
1 heavy,
1 medium,
1 mixed medium and light and
2 light.
If one plans to build it to what ought to be based on reasonably predictable defence tasks (Europe, peacekeeping, quick reaction) then it ought to be:
1 each RegF and ResF heavy,
1 each RegF and ResF medium and
1 RegF light.
In either case the three support brigades should be hybrid RegF/ResF:
1 artillery,
1 manoeuvre enhancement and
1 sustainment.
$.02