@Dianne **********
The best advice came from Graham Seal,
as no financial proof is needed for the application to a single entry 60+30 tourist visa, like it is for an application to a "Non-Imm-O retirement visa"
Why fuss around with the proofs that are required for a Non-Imm-O, which by the way doesn’t give you any minute longer in Thailand than the 90 days you can get out of a tourist visa
. . and you need to do the border run anyways, if you want to extend your stay to 4 months