1997 roundnose
If your building up the ski, you should reinforce it, even though its probably not going to be needed for a while.
So, 9 oz on the bottom, 17 oz on the sides and nose, 2 layers 17 oz under the handlepole mount. When reinforcing on the sides, reinforce all the way to the lip.
Search for ski buildups and research where they reinforce, if its a surf boat, then assume you need at maximum half the reinforcing.
You already have a 62T engine to play with so you have a couple options, all which require tuning past stock.
B-pipe
ADA head at 175 psi (for pump gas 93 octane)
ported cylinders by Lehr Performance Watercraft
Possibly get the cases ported
Aftermarket impeller (13/16 or 13/15 with 3mm cutback by impros)
Could convert to a single 46-48mm carb instead of the duals for simplicity and better low hit
Electronics, most reliable is stock, but Im sure some will chime in Total Loss and MSD enhancer, but TL is expensive and finnicky, and MSD enhancers usually have a limited life
Might advance the timing a bit
Add footholds (Im gonna try and get the Waterdawg R.E.V. holds with the unique ankle cutout)
Keep the stock rideplate
Get a better intake grate (Worx 201 or R&D or similiar toploader grate)
Bilge pump, dual 500 atwoods is popular, although a single 750 atwood would do fine, I only have a single 360 RULE and it does its share
BUT!
If the thing your looking at works as is, then use it for the season, and then blow money on upgrades later. You'll have plenty of power to play with then, and not as much invested.
then you can learn how to ride and upgrade when you need it. Dont get into the I need it now syndrome. I have a 650, and unfortunately I may not be able to upgrade the engine because I need a car, but I still have plenty of fun.