Ok this is what I came up with, cool thing about William McDowell from the songs I heard thus far is that he does not have a lot of activity going on in his songs, which to me is great "Less is more".
So here we go, and you can add a little more phatness to the chord to fill it up a little without taking away from the beauty of the worship, if u want and if I have time I could post later.
I Surrender All by William McDowell
(Arr. by T.J.)
Key of Bb
LH/RH, (1) = Scale Degree
(6) G/D G Bb - Gm I
(1) Bb/F Bb D - Bb sur
(2) C/G C Eb - Cm render
(6) G/F G Bb D - Gm7 all to
(5) F/F A C - F you
(3) D/F A C - Dm witholding
(4) Eb/C Eb G Bb - Eb6 nothing
(6) G/Bb D F G - Gm7 witholding
(5) F/A C D F - F6 nothing
Hopes this helps, Stay Blessed