I have a red Trio 28 with AX8, 1 exp pedal, EBVPJR, G10, and Polytune Black on it. It all fits well. Get lots of compliments on it (cause, lets face it, AX8s are cool!) but I like it mainly cause *I* like it. It just works the way I need it to and becomes transparent to me when I play.
There is a single cross beam underneath center that goes front to back under the board. I'm sure it helps with stability; It also is really handy to tuck cables and power supply. I do experience some board flex at my pedals, they are both on the right hand side of the board and away from the center strut. I mostly have noticed it on carpet though, haven't paid as much attention on stage, so it's not bad. As far as securing things, I really have been happy with Temple's quick release pedal plates. They hold everything very securely, and it's easy to attach and remove things from the board when needed, I would totally recommend them. That, and some cable ties to secure wires, and you're good to go.
Get the carry case, assuming your going to be moving it. Absolutely get the mains power cord if you have multiple powered items- one switch on the side now turns on the whole board, and there's only one wire to plug into the outlet. Also, I used some of temple's hardware to mod the board a bit. I did twin XLR outs on the side running to the AX8- now, if someone trips over my XLR and snaps a connector, it's not the one built into the AX8 but the one on the board- a much cheaper DIY replacement. I also had a 1/4 in input on the other side for a guitar input, but I recently removed it. With the G10, it's redundant. And if G10 fails I can plug a cord direct into the VPJR, so that jack was just added complication and was probably not something I'd do again for my setup.
One of these days I'll actually remember to post a pic!
