Yet another CRM. Should I build it?

I would suggest you to avoid looking at the features of a new CRM and why yours could be better. Look at the target users you want to cover.
It seems that most of the CRMs out there, are focused and tuned to big companies that have a marketing department and salespersons sitting all day in front of a CRM.
I do not know if there are CRMs simple enough (and cheap) for small companies that do only basic marketing.

For my own needs, I had searched for Saas CRMs that have a permanent free plan.
I selected one that although it has a lot of complexity, it is missing some convenience features I wanted (e.g. hierarchical lists of contacts, form to sign up website visitors for a newsletter, who bought which product and when)
At that time, the same tempting thought also occurred to me: why not build a CRM.

But, instead of developing a new, why not just host and manage an existing opensource CRM, or even fork it to make it better?

i said "Yes" because i wanted to do this:

lol.

but, seriously... if you have a unique usecase and a customer already lined up... sure, why not?

but, if it's just another idea without deep thought and/or merit... then, maybe chat with a few folks first... and do a post on IH! which, you've done.

so, there.

Yes.

Some features I'm thinking right now:

1. Import data from other CRM
2. Deals Management
3. Lead Management
4. Contact Management
5. Sales Forecast
6. Reporting
7. Appointments
8. Zapier Integration
9. Email Marketing
10. Sales Insights
11. Workflows: Automate repetitive tasks
12. Own your data: Full control over data with self hosted database
13. Invoicing
14. Client facing portal
15. Create users and clients
16. Gmail integration
17. Mailchimp integration
18. Twilio integration
19. Payment gateway integration
20. Voice calling from within the application

Especially, what do you think about feature number 12 Own your data: Full control over data with self hosted database