Funding / Lender / loan advise needed

[Randy Gross]

Situation:  On Disability due to drunk driver.

Location: Central Florida

i have no payments on my home but it is showing a lien (special program home).

i have a large 2000 sq ft mobile home on it's own ground  free and clear no  mortgage/lien/etc... 

issue/problem  i would like to obtain a loan for about 40k to build a small 600 sq. ft. rental on property on front of my home i already have elect power there, septic and well   there was an old mobile home there i used to live in. (i'm not allowed to put mobile home there unless i put a large one there and that is out of the question)   i would like to use my rental property for security of loan. 

so my income would just be based off my disability and that would not be showing enough to get a loan at bank (my sister lives in my rental shhhh  so it shows' no income)  i would like the loan to go out at least 7 years prefer longer  as i want lowest payments as possible but most likely would be paid off way early.

suggestions/advise?