Okay here is what I have come up with so far for a parts for my 1.5 sink tube. I'm trying to use as many MWS parts as possible as this is my first saber.

MWS Pre-Wired Nano Biscotte Sound Module V3
MWS Short Momentary 16mm AV Switch - Black, White Ring
Cree Star LED & MHSV1 Heatsink Module, White
Heat Sink V3 (Long Style)
2W 28mm Bass Speaker
JST Female connector 26AWG Green
Panasonic Li-Ion 18650 3.7V 3400mAh PCB Protected Rechargeable Battery with JST connector
MWS Recharge Port
9" Electronics shield for 1.25" ID tubes
3.7V Li-ion smart charger with 2.1mm plug

Questions I have:

1. How do I mount the parts in the sink tube as it is 1.5 and most parts are based around 1.25 parts? Would a piece of PVC pipe that is the proper size be a cheap solution?
2. What can I use to mount the Pre-wired Nano Biscotte as what I have seen on the site is for use Non Pre-wired version?
3. Is the electronics shield necessary if I use PVC Pipe as in question #1?
4. I imagine this is a bit of personal preference, but would it be better to go with replaceable 18650 Li-Ion batteries instead as I will need to wire the speaker anyway and therefore could just wire a battery holder as well? I realize I would lose the recharge port.