I'm amazed that you think that the landscape timber pond is complicated. It is the easiest pond to build. Matter of fact I can build one 8' x 4' in 3 or 4 hours. (That includes setting in the liner but not the fill time.)
Step one: Cut timbers to size, drill holes in ends for all thread.
Step two: Install all thread in first timber layer.
Step 3: Stack rest of timbers, tighten all thread.
Step 4: Line inside with foam sheeting.
Step 5: Lay in liner, drape excess over edge.
Step 6: fill pond. (keep liner wrinkle free.)
Step 7: Put final timber over the top to secure liner.
Contstruction Phase...Done.
Good luck with whatever design you choose.
Bo
Step one: Cut timbers to size, drill holes in ends for all thread.
Step two: Install all thread in first timber layer.
Step 3: Stack rest of timbers, tighten all thread.
Step 4: Line inside with foam sheeting.
Step 5: Lay in liner, drape excess over edge.
Step 6: fill pond. (keep liner wrinkle free.)
Step 7: Put final timber over the top to secure liner.
Contstruction Phase...Done.
Good luck with whatever design you choose.

Bo