I think something was lost in communication/terminology here and I apologize for that. You can continue to use LiveCycle Designer. What I think was lost in translation was the fact that you're likely creating PDF forms that you're making available on your website and the browser vendors don't allo...
What you can do is go to the properties of the adaptive form and associate the XDP as the model. Then in the Adaptive Form add a verify step, this will render the XDP. On the verify component there is a configuration option to make it interactive.
How complex are the rules to determine the order and are they determined server side or client side? You can hide and show panels via script in the form or server side you may look at form sets.
A.2. Directory Structure of JBoss EAP 6 - Red Hat Customer Portal Try creating a lib folder in the above location, this is a JBoss question not an AEM questions
Why are you placing instructions outside the form, I need more detail. You could like do this with the guidebridge API but I'd need more detail to make a recommendation. Correspondence management may be a better fit here as well