A new improved version of the Scultie plugin is due soon and a new plugin which is useful for building will also be available.
We have just made available a builder object which allows you to import AC3D models(Exported as 'triangle') into Second Life:
https://uncensored.slexchange.com/mo...&ItemID=382682
It's free to buy/use.
(BEWARE prim limits - try small (few surfaces) models first - perhaps in a sandbox world)