I have a loan where it's a Construction product, but for TRID the purpose is Home Equity, since the house already exists. They're just doing renovations. Should we disclose half of the interest-only payment, or the full payment?

Appendix D would be appropriate for any multiple advance closed end loan when the amount and timing of disbursements is unknown.

"Should we disclose half of the interest-only payment, or the full payment?"

If you mean should you disclose the interest only payment as calculated as interest payable as when funds advanced or on the entire commitment, both options are valid. I believe that when determining which to use look to how it will be disclosed on the note.