btnsmainbmp

Is their an easier method of changing the btns_main.bmp other then using grid lines in paintshop? Got about 1/4 of the way done with it but alligning themis all but an easy task. What method did the esf devs use?

everytime i try to install this in my halflife directory it comes up saying CRC checking failed. 'btns_main.bmp' was not copied correctly. please help me