I have no bone to pick with wanting a custom bike, especially if you're finding it difficult to find a touring body for somebody your size, but I would mention that changing out the gearing on an off-the-rack bike isn't all that complicated and would be far cheaper than a custom bike. So, if gearing is the major sticking point, I think that issue is easily solved. Fit, however, is a stickier wicket.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher