I removed a reference to VOA, as Spanish the OP is entitled to visa exempt or visa waiver and will get 30 days, however as a newcomer Thai Immigration, in most cases, will not ask for the 3 proofs. But I am sure that the airline check in staff will ask you to show an onward travel ticket.
create an yahoo or outlook account, than you get immedate the reply, me too have no idea why just gmail accounts take average 6=8hours. i guess the developer likes to piss off people . it is a nuiance and has been brought forward on many occasions to rtev.
as far as I can see only 2 very minor things which are not completely covered, but overall perfect, why the relevant agencies never update their webpages, like the MFA is a disgrace.
OP will have no problem, but for safety have cash ready to show (THB20k), and onward travel ticket (this also required when you check in and enjoy. On a positive note we had a customer that did a OUT/IN straight after a Non B with WP and he had no problem at DMK.