The seams don't bother me, I actually think that the seams look good, but the thought of taping each key individually irks me. What is the tape's approximate thickness? If it's more than 2mm (or 1/16") than I'd have to mod the KB in order to apply the tape. I'd have to remove the shroud of the keys. Turn this: |---\ |____\ Into this: ____ _||_ And then apply tape to the keys. It could work.
Next to nothing? I realy have no idea, but it's not even close to 1/32nd. It's foil. If you can get all the keys off, it may take an entire day, but it won't be too difficult to cover the whole keyboard. Just extremely tedious.
Round is no problem, it's just the corners that become a problem when you're trying to avoid wrinkles.
