When re-creating CSGads.c with GadToolsBox, there are a few minor changes you 
must make.  The following are diffs between the original (<) and altered (>)
versions along with some comments.

==============================================================================
25c25

< struct Screen         *Scr = NULL;
---
> extern struct Screen  *Scr;

! Scr is declared in CSMain as "IntuitionBase->FirstScreen", so declare it as 
! extern here.  You should also comment out the "extern Struct Screen" 
! declaration in CSGads.h
 
==============================================================================
40d39
< 	(UBYTE *)"-------",

! GadToolsBox insists on two labels for Cycle gadgets, Intuition doesn't care
! won't hurt to leave this in, but removed it to eliminate confusion.

==============================================================================

117c116
< 	(GTCY_Labels), (ULONG)&CYCLE_GAD0Labels[ 0 ], (TAG_DONE),
---
> 	(GTCY_Labels), (ULONG)&CYCLE_GAD0Labels[ 0 ],(GA_Disabled), TRUE, (TAG_DONE),

! GadToolsBox won't save the cycle gadget as being disabled (a bug ??), need 
! to disable it here.

==============================================================================

140,141c139,140
< 	if ( ! ( Scr = LockPubScreen( PubScreenName )))
< 		return( 1L );
---
> /*	if ( ! ( Scr = LockPubScreen( PubScreenName )))
> 		return( 1L );*/

! ColorSaver doesn't currently use LockPubScreen, so comment this out

==============================================================================
184a184,185
> 	ColorSaverGTags[1] = Scr->BitMap.Depth;
> 

! This allows ColorSaver to popup with the right number of palette entries for
! the depth of the current screen.  
!
!   >>>> WARNING <<<< You *MUST* keep the Palette gadget as the first entry 
! in the GTags list for this to work!
! 
==============================================================================