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Can you choose to make your grenades master crafted?

I'm taking it you mean melta bombs for this question and yes you could it's a weapon. Although it could be argued it's wargear so no

I believe that somewhere it says that grenades can never be master crafted but my rulebook-fu is failing me today.

Can you choose the plasma cutter on a servo harness?

Why would you MC a TL weapon?

There is already some contention in another thread about whether or not Chapter Masters' Orbital Bombardments are eligible for master crafting.

orbital bombardment is a special rule and not wargear so it really is another discussion.

As for grenades, I would'nt count them as weapons if I were you. While they have weapon profiles and are listed in the weapons chapter of the BRB your codex does not classify them as a weapon. When you look in your armory you will notice melta bombs and grenades are all listed in the special issue wargear section of the book, so are special ammo types. Since its not really made clear with RAW I have to go with RAI on this and based on the armory I'd have to say they are not weapons (this conveniently also answers the OB question as well so bonus)

But really its a discusion for your gaming group or TO.