May I ask you what were you looking for in this expansion and how many players you usually play SWU?
Moreover where do i put the chasm for the spiderines or the vulcano?
From the SWU Faqs:
Q. How to play Flames in SW?
A. Flames must be used with a volcano. They may take ANY mountain region as their first conquest (spending the necessary number of tokens) then place the volcano on it and apply normal Flames rules. The volcano region is immune as long as the Flames are active.
Q. How to play Spiderines in SW?
A. Play Spiderines as an "Underworld" Race: conquer any Cavern Region at 1 less token
than usual. All Regions with a Cavern are considered adjacent. "Underworld Spiderines" would be useless and their Special Power may be replaced with some other Power in this case.
The terrain equivalence between SW & SWU is:
Black Mountain/Mountain Regions
Mushroom Forest/Forest Regions
Mining/Mine symbol Regions
Mystic Crystals/Magic symbol Regions
Unfrtunately simply flipping the tiles on the underground side doesn't result in a map depicted in the scenario book (2 terrain type adjacent to each other, different terrain ratio etc)
Personally I haven't tried adapt SW scenarios to SWU; but I will give it a try when a have some time and post pictures here.
Scenario 1 (2p) - https://drive.google.com/open?id=1qBBhjGgZ5_TbZ27GhWoOvQUGqg...
Scenario 1 (3p) - https://drive.google.com/open?id=1HlRsMwY4E4IOXNExbsxQJKwO3X...
Scenario 1 (4p) - https://drive.google.com/open?id=1tvOdJoBL2gyTwRpQOmz2-yFTA8...
How am i suppose to adapt it? can I?
You adapt it by being creative. That is why they provided some places/relics without rules.