I have a Laser 120 in mine, the exhaust outlet is flush with the bottom of the cowl. With regard to the retracts they are relay good value for money never had any problems with the ones I use. The dihedral on the wing gives the about the right angle on the U/C, I am waiting on oleos at the moment, to get them flush with the wing I have had to lower the U/C mounting plate. For the elevator I have used a wire joiner with a single push rod down the centerer and to access the coupling for the elevator and the tail wheel I have cut an access hatch in the scope for the tail wheel. I didn't use the plastic wheel well liners I lined mine with 1/64 ply.