Just got a lla from ebay and I love it. the pictures (on ebay) did not do it justice! beautiful engineering & feel.
Congratulations! I had a similar experience - I'd seen photos of the IIa but didn't realise just how beautiful they are until I saw one for real - and then I had to have one
And I love it - I think the IIa is the best of the Retina line. Which lens does yours have? (They came with either a Schneider Xenon or Rodenstock Heligon, both excellent - mine has a Heligon).
And yes, the film indicator is only there for you to use as a reminder - I never bother using it.
There's some information about the IIa here
, if it's of any interest to you.