Re: Blocking/ filling HB rout, will I see seems?
It's not that you'll see seems every time. If you fill the cavity in properly, and with the correct, non-shrinking glue, you'll be ok. The key is filling the cavity with as much wood as possible. Are you filling in the entire cavity?
I'd say go for it....It's the only way you'll learn how to do something like that and...if you do mess it up a bit, you can always re-do it. Also, get a good non-expanding wood putty. As was said before, the other alternative is to cap it or put a veneer on it which itself has drawbacks.