The trick there would be the compiler. Both of them require fairly current ANSI C compilers -- Gecko won't build on less than gcc 4, for example, and I know WebKit really needs at least gcc 4.2.
Short of that, knowing what I know about the individual targets, WebKit would probably be more amenable (Uzbl comes to mind).

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I don't think getting them to compile (in general) would be the hard part, though I've certainly seen enough problems posted on the Webkit list from new hackers. (Building for 68k Mac OS, yeah, that might be a royal pain.) Mucking about with layout logic to support character cell rather than pixel, that's where I foresee lots of work.