RE: Lt-40 as taildragger
That plane is an old ARF I bought back in the 90's. I changed it over to the taildragger, four stroke and bolt on wings in the winter of 2006. It has a couple hundred flights on it.
It lands beautifully. The main gear is from a H9 Super Stick 60 and the main wheels are Dave Brown 3 1/2".
Additional instructions for the tail wheel are that you need to run a tube, plastic, brass, or aluminum up through the fuselage for that tail wheel wire as it will rub against the elevator pushrod.
Also the bottom of the fuselage is not exactly perpendicular to the rudder hinge line. You need to taper your tailwheel brack mounting plate enough to make it true square with the rudder hinge line.