The only thing Scaled Horror does interesting is Improved Grab, which you don't seem to be building to use. Two levels gets both of the most interesting features, and it competes with more Ranger levels for overlapping spellcasting. Look into Improved Grab and grappling and decide if that's something you want to focus on. If not there are other PrCs that Lizardfolk might be interested in, like Tribal Warrior from Miniatures Handbook for Team Rage.
If you do want to go with the Improved Grab, skip the Multiweapon fighting and go for Improved Multiattack (Which might make Ranger an unattractive base class). Use your two claws and bite to grapple the bajeebus out of things and look to add more natural attacks. Totemist from Magic of Incarnum comes to mind, and it works great with those stats, a Psychic Warrior or other King of Smack build could do too. You can keep the tail blade to use so you have one attack that can bypass at least one material DR and get your iterative attacks with.
If you want to focus on Multiweapon fighting, look for sources of bonus damage like Favored Enemy, Power Attack, or Sneak Attack. The Handbook section has good information.
As to the Animal Companion, if you can't think of anything else, get an owl and have put it on night watch. Hoot.
Oh, and none of that is stopping you from having a Katori Resin Tail Blade too.