Damon:

Your SE is supposed to be an aerobatic plane, if you want to maintain this the engine thrust line should be on zero vertically.

Down thrust is used to keep the plane from climbing with an increase in power, opening the throttles. It works, but with an aerobatic plane what works upright is against you when inverted.

Out thrust is the subject of much debate. To be really effective it needs to be at least five degrees, eight degrees is considered minimum by some. Ed Moorman has a twin bash he calls the "Outsider," if you do a search on the name you'll be able to read his arguments in favor of out thrust. I've only used it on one twin, the Tiggerkitty, and that was 1 1/2 degrees on the right engine only. I just don't like the looks of the plane with out thrust.

In favor of out thrust: Easier to handle with an engine out. If you run a vector analysis you'll find almost no power loss to pay for the ease of single engined flight.

Build it with or without, you can shim the mounts later to change it.

Bill.