My younger son is a geologist, I bet he didn't know he could do all that
All this guy's evidence is to try and discredit the previous evidence related to whether OP knew it was Reeva, i.e the ability of RS to scream and the witnesses that heard her screaming, whether OP was able to see or hear her go to the bathroom, whether witnesses (Stipps) saw him in the window on or off stumps, whether the bathroom and\or toilet light was on or off, re the door - which came first gun or bat and also the timing of shots (directly relates to screaming and also OP's version generally, inc him kicking the door).... as well as throwing the odd jibe in about the handling of the crime scene by investigators to discredit evidence collection\photos etc.
There's quite a bit to pick holes in though:
1) His assertion that RS's injuries to her back were from the magazine rack conflicts with OPs earlier allegation that it was in the corner of the room when he found her and that the police must have moved it.
2) The 'model' in the window was on his knees, which is not the same as OP on stumps and he was photographing from the ground and not from the same floor as the Stipps bedroom, hardly comparing like with like. Even when he was standing up, there was no reference made as to what height he was compared to OP.
3) He is still unable to say that all the bat marks were sustained before the shots, so some of the bat sounds could still have made either before or after.
4) Can OP only afford one expert? so had to have a jack of all trades? He may be very competent but really? No explanation of the equipment used for sound and light? and an indoor firing range replicates conditions where a indoor shot from a tiled room is heard outdoors?
They bought the duvet in this morning, so he's obviously going to be a blood spatter expert too.
I must confess I got a bit bored, so I'll wait for Nel to cross examine before I decide which bits are credible and which bits aren't.