You may have better luck than me, but I couldn't fit the MAX232 and associated bits into the footprint of even the much larger SS-Serial board. Even double sided the board still has a few vias.
If you can fit it onto a reasonably sized single sided board, I think we'd all love to hear, otherwise, I sell just the bare board for exactly this reason. If you'd like a starting point, the board/schematic are available at the end of the directions.