Could I get a critique on my first lilypond tab?

[Patrick Horgan]

Anything anyone wants to tell me about better slicker more elegant ways
of doing the same things would be awesome. 

I'm attaching the lilypond file for Let Him Roll, a Guy Clark talking
blues.  He essential plays the same thing over and over.  What I've got
covers the main two variations.

I couldn't find anything that covered hammering and pulling with H and P
either under or over the tab or on the slur line, so just followed the
suggestion to use an appoggiatura for a hammer for something that
switched notes on the beat, and a grace notey sort of thing for a quick
hammer that just borrowed a bit from the beginning of the note for the
original note before the hammer.

I'm not sure how you would know the difference between a hammer and a pull.

You'll see my attempt to put H at appropriate places doesn't work. 
Apparently a TabStaff is missing whatever engraver would put them in?  I
can put them in the regular staff, and it works, tucking them under the
Chords, but it's not at all what I want.  Help!!!;)

Patrick

lethimroll.ly
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