Hey Don, Welcome to the Club! All membership fees can be paid directly to my personal account
I'd say how you finish the interior is a call of what you're planning to do with the machine. Powdercoating is mostly reserved for A+ restorations that are looking for big bucks on resale value. The overall value of the machine needs to be taken into account if you're going to do that, and a square top machine just isn't going to pull that kind of value currently (though I wish the would I'd be doing OK!). Hammertone paint does a great job of making the interior of the machine look updated and covers up any imperfections.