It's good to see someone posting what they have before asking for help. I'll help you out man by giving u what i hear:
Key Ab LH/RH
Part 1:
Bb / Db-F-Ab
magni-C / C-Eb-Ab
fyDb / Db-F-Ab
Him,D / B-D-F-Ab
Eb / C-E-Ab *last time, go on from here
magnifyF / F
Him,Ab / Ab
(repeat 2x)
mag-E / Bb-Db-E-G
ni-F / C-F-Ab
fyHim,F / C-Eb-Ab
Gb / Db-F-Bb
make Him great,Bb / Eb-Ab-C
Eb / Db-F-Bb
make Him great,Eb / Eb
in this place,(back to beginning)
Ab / Bb-C-Eb-Ab place, *bounce chord
Part 2:
Ab /
G /
Gb / Eb-Ab-C
He's greaterF / F-Ab-Db
than your problems,Fb / Fb-Ab-Bb-Db
He's greaterEb / Eb-Ab-C
than your paaa-D / D-F-Bb
ast, He'sDb / Db-F-Bb
greater,F / F
great-Ab / Ab
erBb / Bb
thanC / Bb-Fb
e-Cb / A-Eb
Bb / Ab-D
very-Eb / Db-F-Ab
thing, *bounce chord
F / A-Db-Eb-Ab
oh...(back to Part 1)
2nd time, it modulates to A, so just take those chords above and transpose them to the key of A. Then, here's the 3rd part u need help with:
Part 3, Version #1:
F# / B-E-G#
great in power,D# / G-C#-F#-A *if fingers short, u can omit the A
great in grace,D / C#-F#-A
we magnify you Lord,B / A-D-F#
with our praise,C# / B-E-A
(repeat 2x)
F# / B-E-G#
great in power,D / B-E-G#
B / A-D-F#
great in grace,D / A-C-E-G
G / B-D-G
so great,E / B-D-F-G#
so great,Part 3, Version #2:
F# / C#-F#-A
great inA / A
po-C# / C#
wer,F# / F#
D# / G-C#-F#-A *if fingers short, u can omit the A
great in grace,D / C#-F#-A
we mag-F# / F#
ni-fyA / A
YouD / D
LordB / A-D-F#
with our praise,C# / B-E-A
(repeat 2x)
F# / B-E-G#
great in power,D / B-E-G#
B / A-D-F#
great in grace,D / A-C-E-G
G / B-D-G
so great,E / B-D-F-G#
so great,(back to beginning)
You can still use your own chords, I'm just offering what I hear in the song. Keep up the good work man!!!