So this is why I don't write crossovers...

They're bad news. They really are. There are two existing -- and occasionally mutually exclusive -- canons to bring together with some level of cohesion. There's balance to be maintained between the two canons. Characterisation has to be maintained; if, for example, Character A in Canon X has absolutely no reason to believe that aliens exist, let alone that a facility underneath a mountain in Colorado over in Canon Y has been sending teams to different planets for nearly ten years, and that Character A has to track down Character B who belongs in Canon Y's universe, but at some point in his life was a key part of Canon X...

It's headache inducing.

Which is my own damn fault. I start writing this crossover of DOOM last night, and now, while watching DVDs from Show/Canon X, I get to wondering... who the hell's going to beta this if/when it gets finished? Nobody I know watches X. Sure, they're all into Y, but that's not all I need, especially since the aforementioned Character A from Show X bears a... striking resemblance to Character L in Show Y, which is half the damn reason the crossover came about in the first place.

I've been looking around on sga_beta, but there's no indication anywhere that any of the listed betas even watch Show X, let alone be willing to beta a fic that straddles its canon.

Which brings me to the more fun question of this diarrhoea of the keyboard... who do I now get to watch DVD rips of Show X in order that they may beta for me...??

Cue the evil grin ;)