You don't have to evaluate the assets for WP and a O visa 3 million baht is the minimum requirement for business norms and future expansion get your medical test done list is available online and pay the fee Secondly foreigner can have 49% share if a non BOI entity but his share can be Valued twice to his thai partner to keep the management control
As long as the TM 30 is in their system nothing to worry if you did it online if done physically there should be counterfoil slip.Secondlyif the bank has issued a letter with your balance amount matching immigration rules it's OK
You should contact a hospital immediately if your husband is positive they will have to support you or second option is to approach your embassy and they can take it forward ...At the most you will be fined and it can be negotiated or waived if embassy intervenes.