Bill, several 4-engined P-38 are on my site
http://www.kristofmeunier.fr/#Sit (two of them have been built in plastic, ask with Ctrl-f: P-38T then LR-38M)
Concerning the P-47 with spats, I think the main reason is this argument for Republic towards USAAF: "if you want streamlining with few hp, buy those anemic Mustangs of yours, but with a huge engine and much hp vitamins, we don't care about streamlining: big nose, no spinner, spats, yes, all is different, better!"