Open folders 'Sprites':

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

add beneath it:
fed_prometheus_partAw1 miniimages4 0 0 128 128
fed_prometheus_partBw1 miniimages4 128 0 128 128
fed_prometheus_partCw1 miniimages4 256 0 128 128
fed_prometheusw1 miniimages4 384 0 128 128
fed_prometheusYw1 miniimages4 384 0 128 128

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

add beneath it:
fed_prometheus_partA_si systembackgrounds12 0 384 512 128
fed_prometheus_partB_si systembackgrounds12 0 512 512 128
fed_prometheus_partC_si systembackgrounds12 0 640 512 128
fed_prometheus_si systembackgrounds12 0 768 512 128
fed_prometheusY_si systembackgrounds12 0 768 512 128

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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_prometheus_partA	all_interface_buildbuttons09	104	104	96	96		#	2	2
b_fed_prometheus_partB	all_interface_buildbuttons09	208	104	96	96		#	3	2
b_fed_prometheus_partC	all_interface_buildbuttons09	312	104	96	96		#	4	2
b_fed_prometheus	all_interface_buildbuttons09	416	104	96	96		#	5	2
b_fed_prometheusY	all_interface_buildbuttons09	416	104	96	96		#	5	2