That looks pretty good. Have you ever modelled before? I still remember
my first-ever model, it was an 8-meter plain cube....
As for enveloping, I have no idea what it means other than in character-making it's something to do with bones. I have Modtool 6, the free version, and use Rep's amazing MshEx, so I never bothered to learn how to envelope and animate, since it seem's its for animated character meshes, which are beyojnd MshEx's capability to export. So since I'm never going to do it with Modtool 6 I never bothered to learn it....
As for the texture, there are materials on how to
apply a texture here at GT, but as far as I've seen there aren't any for actually
making the texture. So:
What I usually do is, I see if there are any stock textures that could fit nicely. If I were done with a tank model, I flip through stock assets for generic metallish ones - there are plenty in maps like the Death Star or Bespin. I'm particularly fond of the Oil Refinery texture from Kashyyyk and the Mon Cal cruiser tga.
If there is absolutley nothing that doesn't fit all the way, I open a new texture, gather bits from pre-existing tga's, and fit 'em together like a Jigsaw puzzle.
If that won't do the case (and it's rare that I can't find anything), I open Paint.NET instead of GIMP, set the primary and secondary colors as I wish, then use the "Render Clouds" fractal. This produces a semi-random pattern. Then I just smudge or blur it as I wish. It's actually rather good for a wide variety of base textures, and sometimes I splice these in along with shipped details into the same tga. This Render Clouds trick was pointed out to me by Maveritchell.
There we have it. Now, my contribution done, something a bit off-topic: