some of the damage (such as cracks to the lacquer) can be acceptable depending upon your taste, sensibility and attitude towards conservation and restoration. Many conservative collectors may even choose to leave as is. For me, I agree with Ian - restore/replace the stencilled leathers and fix the haraidate (crest holder) and clean up the urushi.
Relatively speaking, there doesn't seem to be that much damaged lacing (if it's just the two broken strands that are shown in the pic). If it were mine, I could live with it. However, if it's going in for restoration anyway, then I would definitely get these fixed (I don't think the entire thing has to be re-laced, but as you rightfully say, better pics and in-person assessment is required).
Very nice Kabuto.
I am also of the opinion that a few broken strands should not mandate a complete re-lacing. Some collectors prefer pieces in perfect condition, but I actually prefer some minor damage instead of a perfectly restored piece with new lacing. It is however at the end of course a question of personal preferences, but remember we are dealing with antiques. The less we alter, the better.
If you are going to clean / polish the lacquer on the helmet bowl and replace the old leather with new leather but at the same time leave the old, frayed, faded, deteriorating lacing and an uncleaned / unpolished shikoro you would in my opinion have an unbalanced look.
Everyone has their own opinion as to how far to go with restoration / conservation and I am not suggesting that you strip the old lacquer off but lacing was made to be replace and it was regularly replaced. If the helmet is of a high quality the work done should have a balanced look. The shikoro lacquer also has many cracks which would have to be looked at as well.