is there any mod out there that puts the eclipse and executor into skirmish? if not, is there a way to even do this at all?  ??? ??? ???

Apparently you didn't even try to find one...

They're everywhere. Try EaW Files...

the ones on EAW files dont add it to skirmish. only Galactic conquest. ive look everywhere on EAW files, no luck...

Really...

 

The executor is enabled except for 1 thing. How hard is that? Open Starbases.XML. Scroll down to Skirmish_Empire_Star_Base_5 and it even tells you what to do.

 

Adding the eclipse from scratch is more difficult.

Just download the one that adds it to GC, then add this to the end of the eclipse unit:

		<!--<MULTIPLAYER SKIRMISH VALUES BEGIN>-->
	<Tactical_Build_Cost_Multiplayer>80000</Tactical_Build_Cost_Multiplayer>
	<Tactical_Build_Time_Seconds>90</Tactical_Build_Time_Seconds>
	<Tactical_Build_Prerequisites />
	<Tactical_Production_Queue>Tactical_Units</Tactical_Production_Queue>
	<Build_Limit_Current_For_All_Allies>1</Build_Limit_Current_For_All_Allies>
	<Build_Limit_Lifetime_Per_Player>1</Build_Limit_Lifetime_Per_Player>
	<!--<MULTIPLAYER SKIRMISH VALUES END>-->

and the name of the eclipse that you edited below what you did to the executor's name in Skirmish_Empire_Star_Base_5.