I'll start with the easy one: Weapon placement.
This is a known bug. One of the weapons (or more) that you are trying to place on came from a new mech. Weapons stripped from a mech that it was bought with have little "I got into slot x when in x location" tags attached to them. Any time you place that weapon in a mech, it will always try to go into it's "reserved" place. To solve this, sell off the weapon and rebuy. If you don't want to sell them all off, take off the weapon, and sell only one weapon at a time and retry. Once you sell the weapon with the invisible tag on it, you should be good. (Selling them all and rebuying is the fastest way of going about it, but it isn't the most cost effective.)
As far as saving for more Wolverines or not... I'd make my next wolverine (if I was you), the 7K. Why? It's got an XL275 engine in it stock, which will give you a cheaper XL275 engine to work with. Then, you can remove that engine from that one and move it from wolverine to wolverine as needed. (This also presumes that you desire to stay with that sized engine with all your Wolverines.) This should help open up more customization options for future Wolverines, and future mechs as well. (And the 7K looks like it might be an easier ride to work with...)
What I would suggest for the
Wolverine 7K (or rather, what I would probably try using and see how it works).
(Edit: Ignore the 280 engine in the example. You would just keep the XL275 stock, and add in more heat sinks, ammo, upgrade a laser to a med pulse... )
Edited by Tesunie, 22 April 2014 - 10:08 PM.