It's probably too late, but I think you are going to wreck your deck doing this. Water will leak through and rot the wood, also the weight might be too much.
3 yard truck full
162 bags. You would be better to order soil in bulk delivered by dump truck.
Yes, this is garden bed is expected to be installed and left installed.
3/4 inch thick
You can hire your own assembler and instructions says it takes a professional 5hours to assemble
No but it is strong enough
Made at top in two sections that can easily come off for the winter months. Also put up screening over the deer proof section to keep out smaller critters
3 yards of top soil, so like 3 large pick up trucks full
Unfortunatley the manufacturer does not offer this garden bed with bird netting.