Here are 2 insights about tail dragger gear placement and rudder size.

Placing main gear under the wing leading edge is not exactly the right answer. Forward placement prevents nosing over but the plane will want to swing around (ground loop) when it swerves on the runway or porpoise when you don’t touch down softly. Moving the mains back stops those problems but makes it easier to nose over. The way to fix all those problems is push the mains back behind the CG then add a nose wheel. A good tail dragger thumb rule is to locate the mains where the pane will balance on the mains when the fuselage is tilted about 20 degrees nose down.

Tricycle gear track straight naturally and don’t need much help from the rudder to steer straight down the runway, so trainer types typically have tricycle gear and rather small rudders. When trainer types are converted to tail draggers they often could use a bigger rudder.

There is no one exact right answer for conversion. It is a matter of preference. When you fly your conversion, here is how to evaluate it. If you find your plane tends to ground loop or porpoise annoyingly during landings, then your mains are too far forward. If you find your plane tends to nose over too easily, then your mains are too far back. And last, if you just can’t find a happy medium then your rudder authority is probably insufficient.

Experimenting is all part of the fun. Hope that helps.