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Setup a bench ray diagram, it will allow you to work out baffle interval and required diametre. I did this for my 127mm f12 iStar truss tube build and It's worked out perfectly. Get some bright coloured brickies string from Bunnings for the rays. For ep field size most eps have field stop suze info available. At your focal length the cone will be fairly narrow anyway so as long as your focuser has adequate travel you will be ok. Set your focuser for midpoint of travel and run the ray strings through it to a point near the end of travel. That will be close. Final star testing to trim tube length maybe needed. Don't secure everything until you can verify on star testing.
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