Apollo’s advice is great, as always. As a new Nomad user, you may also find this thread useful - I personally found it super helpful when I was first trying the same experiments, and to this day I think of flipping in terms of the Millenium Falcon doing loops or barrel rolls:
This solution, created by @FlatBaller, will make flipping things a great deal easier, if you care to try it:
And here’s a photo of what I’ve come up with, which has the advantage of being removable when I want to machine stuff that takes up the whole bed:
I used a couple small pieces of scrap wood I had around, screwed them to the spoil board, then used the nomad to cut my angle so it would be square to the machine. I also had it mill some dowel holes all the way through, and I find that these are sufficient to keep the wood in place during milling. Note the dog bones at the corner, very important. I use this setup regularly to do two sided machining jobs, using only double sided tape to hold the stock, with very good results. The key thing is being able to register the stock along two sides.