Hi Ross

Your doing a fine job; just take it a bit at the time and you'll soon have a runner

In heinsight I should've drilled the hole for the cylinder port before drilling the bore. It'll leave a burr when I do, but I've made a little makeshift honing tool which should clean it all up a treat hopefully.
Kudos to you for thinking through things like that

- you'll find thinking about things a bit on future projects one of the best tools in your shop, but it does come with a bit of "learning the hard way"

The burrs are a problem either way; if you did the port first, it's very likely that the boring operation on the cylinder would leave a burr in the port - slightly blocking it. That then has to be cleaned up by running a drill through, and in my limited experience will bend over a bit of the burr into the cylinder again - requiring a bit of a lap or run-trough with a reamer again.
Either way in my experience, you need to fine-finish the bore of the cylinder as a last operation.
Don't worry about this too much for your first engine though

- once the bug has bitten you and you build more engines, you'll naturally start thinking about these kinds of issues. The main thing is that you take every bit that you learn and try and apply that later - sometimes its frustrating, and at other exhilarating - but either way its a load of fun

, Arnold