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1NT 2C 2D
--- 2NT FG Shape enquiry - are you 4333?
--- --- 3C  Not 4333.
--- --- --- 3D Stayman
--- --- --- 3HS 5 card suit
--- --- --- 3NT or 4HS to play
--- --- 3D  4333.
--- --- --- 3HS 4 card suit (still FG!)

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1NT
3C/D/H/S splinter FG.  Shows singleton or void in next suit up

So add, under game strength hands . . .
1NT 3suit Splinter - void or singleton in next suit up.

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1x 2NT shows either 16+ no 6 card suit no singleton/void, 
       or (only if 1x is major) a sound raise to 3.
Opener responds
3C artificial 5 card suit, any strength
    3D response shows doubleton, 16+ bidding reverts to natural
    3x x major shows sound raise to 3
    4C/D Swiss 16+ 3 card support.
3D artificial 6+ card suit any suit, sets trumps.
    3x x major sound raise to 3 type
    4C/D Swiss at least 2 card support (slam interest if minor)
3x x major 4 card suit decline invitiation if sound raise to 3
3NT 4 card suit opened, accept invitation if raise to 3

Lots of room for further clarification.