For home etching, you would want as many of the traces on the bottom layer as possible. Without having plated thru holes, it is difficult to impossible to solder some things, like electrolytic capacitors, the pot, etc. from the top side. Anything that will not fit on the bottom layer will need special attention for solderability (vias to bottom pads, which can be filled in with a resistor lead soldered to both sides, etc.). If your intent was to have the board made professionally, then you don't need to worry about that.