[Dawn]

You could put this below your UnitSpecific code

-- raid, party
do
	UnitSpecific.party = function(self, ...)
		Shared(self, ...)

		-- your party stuff here	

	end
	
	UnitSpecific.raid = function(self, ...)
		Shared(self, ...)

		-- your raid stuff here
		
	end
end

spawn them ...

oUF:Factory(function(self)
	
	-- spawn party
	self:SetActiveStyle'YOUROUFLAYOUT - Party'
	local party = self:SpawnHeader('oUF_Party', nil, 'custom  [group:party,nogroup:raid][@raid6,noexists,group:raid] show;hide', 	
		'showParty', true, 
		--'showPlayer', true, 
		'yOffset', -10, 
		'template', 'oUF_SlimRaid',	-- party pets
		'oUF-initialConfigFunction', ([[
			self:SetWidth(%d)
			self:SetHeight(%d)
    ]]):format(WIDTH, HEIGHT))
	party:SetScale(YOURScale)
	party:SetPoint("TOPLEFT", player, "BOTTOMLEFT", 0, -40)
end
	
	-- spawn raid
	self:SetActiveStyle"YOUROUFLAYOUT - Raid"
	local raid = self:SpawnHeader('oUF_Raid', nil, 'raid',			
	'showRaid', true, 	
	'showPlayer', true,
	'groupFilter', '1,2,3,4,5',
	'groupingOrder', '1,2,3,4,5',
	'groupBy', 'GROUP',
	'maxColumns', 5,
	'unitsPerColumn', 5,
	'column', 4,
	'columnAnchorPoint', "RIGHT",
	'columnSpacing', 6,
	'yOffset', -6,
	'oUF-initialConfigFunction', ([[
			self:SetWidth(%d)
			self:SetHeight(%d)
    ]]):format(WIDTH, HEIGHT))
	raid:SetScale(YOURScale)
	raid:SetPoint("TOPLEFT", UIParent, "TOPLEFT", 30, -30)	
end

Obviously, all that stuff in the spawn function is custom code. You have to change it to whatever you want your group frames to look like.

€: The raid code is for a 25 man raid, btw.