Yes, all Altamura Bodies/Fullbodies are Omega compatible. On the older non upgraded bodies, wear Omega Relay for Altamura (you find it in the Main Store or in the Marketplace). The first time click on the Relay to activate it. To apply your clothing, lingerie, or tattoo simply click on your applier, and you see in the body. All Altamura bodies have 2 clothing layers (another one than usual), it means you can apply at the same time for example: 1 tattoo, 1 lingerie, 1 dress (top and bottom), 1 jacket.
To properly use Omega on thee bento mesh with upgraded HUD, simply wear the Omega installer and click it to install it. You may then use any Omega appliers.
To see 4 layers or sometime to see your layer you have to wear (you find in the package):
Altamura: 3- “name X” CLOTHING