DGA does have minimum salaries for union directors, which for a feature film is currently in the neighborhood of $19,000 per week, which would equate to roughly $12,000 in 1995 dollars, assuming the rates have tracked with inflation over that time span. Production seems to have been around 12 weeks, from what I can determine (no idea if or how that DGA wage factors in pre- and post-production), so I would calculate the absolute minimum he might have made for directing the film was around $144,000. He also separately would have gotten a script acquisition fee, which would have netted him at minimum another $30,000 (almost certainly higher than that, though).
He would additionally have had a separate agreement on top of that as a producer, though that may or may not have included any upfront money. If it was strictly back-end, I'd be surprised if he ever saw any money from that. Studio accounting departments are masters at making even wildly successful movies end up in the books as not technically turning a profit, much less a mildly successful cult film.
So anyway, I'm pegging his take-home at a minimum of $175,000, but I would bet the $40 in my wallet it was actually more than that, probably in the 250-300 range. Personally, I could live off that for a while, especially after taking in a little extra doing music videos for his friends.