Yes you are correct by saying the actual data move would be pretty simple....thats not a problem...the problems start with your customizations. Obviously they can't be carried over to Links SQL in their current state so they'd either need to be ported into SQL code or you may find existing plugins/globals/hacks that do the same job.

What you really need to do is write down a list of custom hacks you have made and then if you want you can post them here and then we'll be able to tell you if they currently exist or not.