Adult tricycle to customize

[purple monkey]

The following is a tricycle that I would like to motorize and add a seat with back to.
https://www.amazon.com/gp/aw/d/B000IORU06/ref=s9_simh_gw_d0_g468_i1?pf_rd_p=1c5f02ae-183e-4906-990b-5a293310a66c&pf_rd_s=blackjack-personal-1&pf_rd_t=Gateway&pf_rd_i=mobile&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=4HY2F7DBEC044G0CW53Y

I am sick and can't ride a bicycle.

Suggestions for the motor and seat recommendat ions would be great.

I am unable to drive and this would help me with getting out some.
TIA