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The only rules regarding scratch-builds and conversion are that A) It must be clear what each model is and what it is equipped with, and B) With the exception of basic wargear, the equipment on the model must be EXACTLY the equipment that the model has, and the equipment loadout must be legal.
For example, Tactical Marines have the default equipment loadout of a bolter, bolt pistol, frag + krak grenades, and power armour. You do not need to specifically model all of those things onto the marine, just enough of them that they actually look like tac marines (which is most likely a bolter plus power armour). However, if I want to upgrade one marine to carry a special weapon, such as a flamer, it actually has to be carrying something that clearly looks like a flame-thrower. It also can't be carrying a flamer plus another weapon, and it can be the only model carrying a special weapon in the squad (you could give another marine a plasma gun and just decide for that game that it has a bolter instead, it would be too confusing and leave the system open to abuse).
The general rule of thumb is WYSIWYG, or What You See Is What You Get. As long as it is followed, nobody should have any complaints unless you are making massive stretches to justify what something is.
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