Find your favorite 3 or 4 toneboards and draw a rough amalgam of these on a dense block of domestic hardwood with a hole in it. I've made several from hard maple and still use my favorite of them as my primary upslope jig, I've cut nearly 200 toneboards from that ugly bastage... If you have a decent source of a wood that will hold up to the abuse, I recommend starting straight away by cutting an approximate jig out and modifying each successive one, after working several toneboards, rather than free handing.