Counter-rotating shield

Digest 1063:

RKH
> Design requirements for including spin would be tantamount
> to building a whole 'nother habitat shell. [tho open
> ended/non pressurized.]

M.C.
The argument has been that this structure would be the radiation shield,
and thus would represent a structure which we would have had to build in
any case.
RKH

>> ... the shielding weight/strength
>> requirements for the habitat itself would be very much
>> reduced.
>
M.C.
Or eliminated entirely. The radiation shield is the counter-rotating
mass ....

So, we are left with a single cylinder with much reduced weight &
strength requirements plus a counter-rotating external shield
equal in kinetic mass to the now reduced-in-mass cylinder, [plus a mirror].

The question is, -Can this concept compete with the original concept of
two counter-rotating cylinders?

-There are obvious savings, but is there any obvious flaw? i.e.,

-Is the idea worth pursuing?

RKH