I'd have to kinda sorta agree with Nanook of the North (Minn Flyer) The Goldberg is probably on par with GP to build , probably flies better, but if you're after scale, go Sig. I don't know how the OS 70 measures, compared to the Saito, but my .65 is 3-3/4 in. from the center of the prop shaft to the forward edge of the valve covers (the part that sticks out of the cowl), and at that distance back from the flange for the prop, it would have to be about 3-1/4 to fit inside. It is easier to not worry about it and just stick the motor, uh, engine, on sideways, but us scale freaks like things all nice and tidy and hidden inside. Even if you did have to cut the cowl, it's down under the "chin" and not very noticeable at all, UNLIKE THE BIG GAPING CHUNK (sorry) that you have to excise from the pristine and HIGHLY VISABLE (sorry) side of the cowl, if you do it , ahem, the OTHER way

If you notice the "skint" place on the oil cooler, it's made of hobby ply and is sort of a sacrificial detail, because when it lands and tips up on the nose every now and again, that's the part that takes the grief; it reinforces the cowl and also helps protect the valve covers, and it's easily replaceable.