I picked up a copy of the mek at 'thedemonslair' for about 8,- Sure, not exactly a steal but I decided to treat myself a bit (went ahead and got some adventureres and panzees too, haha).
When it comes to tweaking sc plastivcs: not to disparage your modelling skills but yeah, good luck with that. I've had enough of these plastics after doing just the one arm. Doesn't take paint well, everything is blotchy and highlights somehow magically vanish the second you put them on. Even cutting the arm off was a pain since that kiddie-proof toy plastic is surprisingly tough; ended up actually sawing the arm off. With an actual saw, like some southerner who doesn't know how to handle a knife.
Also, the head/face is terrible. Ugly, misshapen, weird mouth, it's just bad all over. Body, kit - all pretty good, but that head.. just no, I don't think that'll ever look good.
Those sc plastics were the first minis I ever painted - using enamel paints and a brush from a school watercolor set.
Actually, if I'm being totally honest, the more orks I paint, the more I realize that I'm assembling and painting exactly the minis I gawked at in the catalog for ages when I was a schoolboy. Back then I thought 'I'd never be able to afford them and even then, I could never do them up to look proper nice' And now, I'm actually assembling the ork warband of that schoolboy's dreams and that schoolboy is me. It's weird.