does this sentence make sense?

[bartholomew]

I am poor as a church mouse, but I will give you my food, not that I have much.

Any correction appreciated.

[davver]

Perhaps:

'I am as poor as a church mouse, but I will give you my food - not that I have much.'

The comma is not strictly necessary, but I feel acts well as a caesura to balance that part of the sentence, and reflects the way it would be said. Then again, I do have an overenthusiasm for commas, and tend to overuse them.

The 'not that I have much' might be construed as a tautology, given that the speaker has already declared that he is poor. An alternative is 'I will give you my food - not that I have much. I am as poor as a church mouse'. On the other hand, if it is direct speech then it doesn't really matter whether the sentence is particularly well constructed as long as it makes sense and is in character.

[Clanad]

The fewer words the better in this type of declaritive sentence...

Though I'm as poor as a church mouse, I will give you the little food I have.

[scorpiop3]

this means that you don't have much but  you give the shirt off of your back to someone cold ,or that you would give up your comforts of home to allow someone else to sleep in it.which boils down to that you are a great giving person.

[Peter Pedant]

The third word has to be 'as'

The rest is subject to taste. But should link two similar clauses, so this means that 'not that I have much' is sort of flapping in the wind. Separate sentence, I do not have that much.