Welcome to the board. I was also in the market for a new bow recently and was having a hard time deciding between the widow TF III and the widow PSA III . I ended up ordering the PSA III 60" 65@28 . I decided that the extra mass in the riser would help and wanted the cnc machine riser because I know if I order extra limbs they will fit or if I order a backup it will be identical. It should be here in around two months. No idea about the limb length question though. This is a great bunch of guys on here if ya have questions or what not. Good shootin