Hi Nomad, I stopped short of mentioning new gear but as you've done that you should be ok now. One or two tips to avoid disasters at this early stage:
Once you have all the gear installed and run the dive unit up on the bench, make sure the tubes are nicely seated on their rubber seals and don't tighten them up too hard otherwise you may damage the perspex end caps. The white seals when new, are flat but with age and pressure, may have grooves impressed into them. This is ok but if they are deeply grooved, they may not seal as originally intended so keep an eye on this.
Take just the unit and battery, fill the bath up and prior to connecting up the battery, plunge the unit into the bath for a few moments, around ten seconds or so, now take it out and look through the end caps for leaks. If this is ok, hook up the battery and run the unit up whilst holding it underwater. Run a full function test and Keep checking for any obvious signs of leaks and if you have any, establish where they are coming from and rectify as neccessary.
Once you have established the watertight integrity of the unit, you can fit it into the hull and run a full test on the boat.
If the previou owner built and ballasted it correctly, you should have yourself a perfectly good working sub which will go for years with the minimum of attention.
Just one last thing, once you have got used to your sub, its worth fitting a Subtech self leveller. With one of these fitted, you will be able to run this sub full throttle with 'hands off' at periscope depth.
Good luck with it. If you run into problems, give me a call, although I am getting over a recent 'op' I am usually around although not fully back in the workshop yet.
Best regards.....Chris
PS,only use the word 'bubbles' when refering to other makes of sub!!