@Jason ******
, I would say IF you're not going to meet all the requirements at the thai consulate in Phnom Penh don't waste the time going there just to get denied.
Instead to go the thai consulate in Vientiane Lao for your single entry tourist visa. They don't require any proof of funds, proof of onward travel or proof of a hotel booking. It's the easiest thai consulate in S/E Asia to deal with.