Open folders 'Sprites':

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Open 'miniimages.spr' and find the following line:
fed_galaxyw1 miniimages1 384 128 128 128

add beneath it:
fed_cheetahw1 miniimages4 640  128 128 128
fed_cheetah_TMPw1 miniimages4 768  128 128 128
fed_cheetah_TNGw1 miniimages4 896  128 128 128


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Open 'systembackgrounds.spr' and find the following line:
fed_galaxy_si systembackgrounds2 512 0 512 128

add beneath it:
fed_cheetah_si systembackgrounds13 0 384 512 128
fed_cheetah_TMP_si systembackgrounds13 512 384 512 128
fed_cheetah_TNG_si systembackgrounds13 512 512 512 128

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Open 'gui_global.spr' and find the following line:
b_fed_galaxy	all_interface_buildbuttons02	0	208	96	96		#	1	3

add beneath it:
b_fed_cheetah	all_interface_buildbuttons09	104	416	96	96		#	5	2
b_fed_cheetah_TMP	all_interface_buildbuttons09	208	416	96	96		#	5	2
b_fed_cheetah_TNG	all_interface_buildbuttons09	312	416	96	96		#	5	2