Good to see you are getting there Behzad - the clearances for the gear are very tight but it is possible to get it right with plenty of time and patience ! Just adjust little by little until its perfect. Everyones will be slightly different due to the scale leg mouldings and exactly where / how / what angle they are attached to the leg. I did not need to sand any of the skins on the 2 Hawks I have built but it is all a very tight fit. I have ended up with pretty much straight tracking with a very slight toe-in bias.
If anyone needs any pics or measurements other than what I put in the manual please just let me know. Here are some pics of mine - can't wait to get its brother finished and flying, almost done now! The next one will be fully weathered to bring out all the lovely detail.
regards
Colin