I don't know much about Frank's Roundhouse. I seem to recall him re-doing some of the Lionel Classics to reflect some of the rarer trains like the Green 390E. I think he also did the Blue Comet flavor of the 390E as well.
I post this for two reasons: Al sent me the scans and I find them interesting and I have seen these (or what looks like these) start to appear in auctions and on eBay.
I'd love to know what happened to Frank and his roundhouse. His catalog was pretty darn cool and the trains are some very nice standard gauge. If he did refinish trains or build new one's, he did an amazing job!