Faceting itself does not necessarily destroy readability.*
There's much more to it than that! :-) If/when you target
small sizes you will however need to worry about proper
"stroke" contrast, vertical proportions, width, spacing, etc.
In fact, just like thin strokes have to be thickened, those gaps,
being also small features, need to be enlarged. On the other
hand I might consider dumping those anyway.

* You might want to look at the work of John Downer.

BTW, although I'm not a fan or "constructed" type, if
done sensitively this can turn out to be quite nice.

hhp

Does anyone have any advice on how to check for legibility during their process?

Look at it at small sizes often as you go? :-)

The key test is in the intended use. If it is print, you need to regularly check printouts at intended size, taking into account the difference between your printer and offset, if that is your target. If on screen, then screen at intended size. Also you need enough characters to do words, so that it can be read, not just looked at.

Keep going. Show us more. I really like the /a although I would join the bowl with the stem.

Really interesting design. I would love to see more.

I'd design some more letters, before I start worrying about that.

@animal: Which software is this that displays all these guidelines?