Customized form

I need to have a html form with upper and lower sections, each section has multiple tabs.

The ARAS form builder seems not supporting this layout, if I have to develop a customized form, how to make it work with ARA.

What I need to do is --> when the workflow goes to the last step, the user clicks the assigned task in his/her basket, then this customized form will be displayed with all data fields populated from server.

I am new to ARAS, any suggestion would be helpful.

Thanks