Welcome to the thread wybornya.
I won't personally have an opportunity to load your textures you referenced until later this weekend, but I look forward to it.
Your help and expertise would be most welcome here, as long as you follow the main themes regarding the project:
1) Try to recreate the original artist's concepts and ideas in your retextures, but of course in higher rez (some "creative licences" are allowed, but try not to go too far; I have personal experience here)
2) Submit your work (and screenshots will help too) to the community for opinions and comments, whether said comments are negative or positive.
3) Death--Droid is currently leading the project, and this is his brain-child. So in a nutshell, what he says goes, and so far I've agreed 100% with all his decisions. He has a very good eye for artistic work, and is invaluable in this regard. Please pay him the appropriate attention when and if criticism is offered on his part. He's a very busy person, and therefore he can't give long and detailed responses to all submissions.
4) Have fun! Honestly, this is the most rewarding experience I've had for a very long time. I am by no means an expert in retexturing, but have learned quite a bit from the comments offered in this thread. Please enjoy yourself!
@Phillip, sorry I have no experience in Glide64. I've heard good and bad things about it. I personally use Aristotle&Mudlord's Rice video plugin with PJ64. With the proper configuration, I have few problems. Maybe one day I'll give Glide a shot. Squal-Leonhart is the Glide64 expert in these parts.