To expand a bit more: I guess there are two categories of difficulty: changes to the actual gameplay (since you're changing from a parser to a p&c interface) and then the mechanics of actually converting the resources to the new format.
I don't think the latter is all that difficult - just tedious. If I were doing this, I'd start with a blank SCI 1.1 game, and then port things over piecemeal. Start with just one simple room to see how difficult it is to get things up and running.
- For pic backgrounds, you can just CTRL-C copy from a SCI0 pic and "import bitmap to pic" to an SCI 1.1, to get the background. The control and priority screens are more difficult, but you can copy pic commands from one running SCI Companion instance to another. But then you'll need to manually go through the pic commands to remove any "set visual" stuff (or just redraw them by hand). I feel like I wrote some functionality to do this automatically at some point, but I might be dreaming.
- For views, you can export a loop as an animated gif in SCI0, then "import image sequence" in SCI 1.1.
- For scripts, the room setup is a little diffierent, so you can't really just copy/paste an entire room script over. But you can probably mostly copy individual instances and procedures over manually. The scripting isn't that different in SCI0 vs SCI1.1
And of course then you need to figure out how to map all the Said parser clauses into doVerb switch statements, and put all your text into message resources.
