(Yes I searched

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Hate to show up and start asking for help right away but I thought I'd give it a go hidden in a bit of an intro thread
Bought a 2014 Outback in Dune colour recently. Took it out for the first time on Wednesday and I have to say...comoaring this thing to a paddle kayak is like comparing a horse and buggy to a Bugatti Veyron. It's staggeringly good. Easily one of the coolest innovations I've seen in a long time. I'm mostly surprised how few people know it exists. Now that I've kissed the forum owner's ass sufficiently, let's move on.
Here's a pic of it loaded up on my car...

I will run through a few questions
Here it is precariously hanging above said car in the garage (the Audi RS4 forum guys would probably ban me for that)

Here's a quick video of me racing a friend in his bass boat on his trolling motor at full power (it didn't go well for him...he was sure he'd win so he let me jump out but never caught me)
[URL]
https://youtu.be/Q3Qy-EVBTVU[/URL]
I will mostly fish freshwater lakes here in Ontario with the outback, and I primarily target bass (both largies and smallies around here) and pike (mostly by accident when looking for bass). Once in a while I will go looking for musky as they're just epic.
I have a few questions if anyone wants to save me a little more digging around
1. Is there a mounting/dismounting technique for putting the outback on a sedan roof rack that's universally considered best?
2. Is a lowrance 5 or 7 fishfinder overkill/too bulky? Should I stick to a 4?
3. Is sidescan (lowrance HDS) worth the bother (fancy transducer, awkward outboard mount etc) or should I stick to sonar and downscan devices?
4. GPS on the fishfinder or no GPS? Trying to figure out if it's worth the $300 price delta (after buying a gps model and a chip etc). I figured I wouldn't go far enough from launch to need GPS for location...just for finding suitable depth to fish (I.e. Shoals and humps that hold smallies) but I can always do that on my phone in advance with my phones navionics charts. Of course mucking with your phone when surrounded by water is not smart so perhaps there's a case to be made for an all in one fish finder. I don't like buying things twice so hopefully you guys have some feedback.
5. I'm going to upgrade the seat using either a Jackson elite mod or something else soon and was wondering if there's something newer that people like better or if it's still the elite? What about the elite 2.0 or 3.0? I have to say the stock seat is very comfortable but I want to be up a bit higher for casting as I'm 6'5" and with long arms and 7'+ rods, a little elevation would go a long way.
Otherwise great site and I hope to be enjoying it, and my outback, for quite a while.