Re: The Monster Mash (Up)
While I do love the old classic movie monsters, monster figures really aren't my thing but I do try to help when I think I might have a useful suggestion. As for Frank's body, have you considered just using a regular but somewhat buff body with padding under the clothes? As for the longer arms, you could try doing the opposite of what many customizers do to make a figure of shorter stature. What they do is remove sections of the biceps and forearms (along with the torso, thighs and calves) of a figure and then glue them back together so that they're shorter. I'm thinking it would be fairly simple to do something similar but add extension pieces rather than removing material.
I really have no idea how important articulation is to you and that's why I suggested the vinyl kit. If I was putting something together like what you have in the works, then it wouldn't matter to me that the Creature (considering that it doesn't wear clothes) had no articulation if it looked good in the display. I personally detest visible joints (I hate neckless sculpts for that reason) and prefer aesthetics over visible articulation.
As for Dracula, I can't really make any recommendations as far as any specific clothing or accessories are concerned. There might be some suitable Victorian era clothing available from one of the recent Sherlock Holmes themed figures or something but that might cost even more than the Sideshow figure. As for a Dracula head sculpt, the only head that I've seen that looks like Bela Lugosi (that's the look you want, isn't it?) besides the Sideshow figure is another vinyl kit.
Movie Dracula VLAD Bela Lugosi 1/6 Figure Vinyl Model kit 11inch | eBay
Sgt. Markoff: "Keep shooting, you scum! You'll get a chance yet to die with your boots on!"