I have no idea where this 1 month of 800k or £20k in the bank is coming from. It's 3 months for 0-A Visa if using lump sum method and 6 months of income if you using the income method.
This is from the Berlin Thai Embassy. You will need to meet all this criteria for a simple Tourist visa.
The EU is becoming more and more difficult for non resident card holders to apply even for other EU citizens.
I do not know what a 'Biometric' passport photo refers too that they are requesting. I'm not sure if they are requesting an extra photo or the original passport and photo needs to contain biometric data?
Tourist Visa
TOURIST VISA: (60-day stay, one entry)
Non-German citizens please note in advance the list of countries
completed visa application : the exact address of at least one accommodation (exact number of house number, street, postcode and city) as well as a guarantor a contact person in Germany must be specified)
Passport in the original
Copy of the first page of the passport
1 biometric passport photo (taken in the last 6 months)
Copy of flight confirmation or flight tickets (round trip or onward flight)
If only one-way ticket has been booked, an exit must be proven (flight, bus or train ticket, hotel booking in the neighboring country or visa for the neighboring country)
€ 30.00 visa fee
for children up to 15 years of age, an additional copy of the birth certificate and the copy of the parents' passports must be submitted
*** Please note that additional documents can be requested additionally ***
Please pay attention to the submission of the correct visa application form (the Thai Embassy Berlin)!