It is absolutely fine to check your ideas before I implement my suggestions or ideas to grow your real estate business; Please let me know when you can share your existing website portal; So that I can check it; If you have any issues, can share your screen with me. So that I can check the details via teamviewer.
Here are few suggestion which will help customers to use this portal and grow your business with reduce your manual labour:
As there is Payment or deposit plan in your mind, to make it better, I can also enable a reminder system about payment plan; So that customer be well aware about the payment plan details and make payment timely;
Regarding Appointment system, after confirmation of their appointment, the system will automatically send confirmation emails and sms to the customer; And also it will give reminder to the customer before 1 or 2 day of the appointment date;
In case if customer, schedule an appointment and later few issues arise on the date of appointment, they can reschedule the appointment; But in this context, I will keep the space so that one user can reschedule their appointment only 2 or 3 times on a certain time interval let's say it is 3 months or 5 months etc;
With room dimensions, customer be able to upload any layout plan as per their preference in this portal. So that customer can specify which directions their bed room should be, where the kitchen be located etc.
There are many more suggestions which I need to discuss with you;