Not a fan of the fat TW style wedge. Eastonmade looks pretty good to me, but I've never have used one. I emailed him once, and he emailed right back. Says a lot right there I think. Also talked with him at the Paul Bunyan Show in Ohio.
I use two log decks. Last fall I modified one by decking it over because short pieces would fall through the rails . That also gave me a platform to noodle on. The large pieces and short logs came from a neighbors. Most of what I buy is 6"-16" x 100", so much, much smaller than what your doing.
At one time I thought about getting a vertical/horizontal splitter, adding 4' width to the log deck and setting it up vertical on top of the deck. Tip up the rounds, and slide the rounds on conveyor rollers to the vertical splitter. The control valve might have to be relocated.
Not enough big stuff to do that, but the idea was from the bench to the SuperSplit.
I put the TW money towards a one ton pickup a year and a half ago. No regrets.
Note: In the fifth picture the splitter is backwards. The Beech and Oak from the neighbors got thrown in a trailer and hauled to the wood shed.
As rider said, without a conveyor you will need to move it frequently with wood that large. Makes for a lot of great barkless splits which is really clean firewood.