Is this for the range and/or home defense or for carry? Man you don't need anything that size for carry!
I mean its not impossible, I've carried a full sized 5" 1911 a few times but look at 4" length barrels instead. Lighter, shorter, being shorter means easier and less likely to have draw issues, easier and more comfortable to carry iwb, etc. It'll be just as accurate and still provide that 15-17 round capacity.
We were out last night up in Christiana Mall so stopped into Cabela's. They had a good selection of Walther's including the P99, P99c (AS model), PPQ, PPS and CCP (great women's gun with an easily rackable top slide). Priced more then Chris of course but everything in stock to manhandle before ordering through Chris.
Being a Lefty I'd highly suggest getting your hands on a P99 AS (or the Classic M1 PPQ) and feel their grip and use its ambidextrous paddle mag release built into the lower trigger guard. The PPQ additionally, has a fully ambidextrous slide release on both sides that was also designed to properly chamber a round from the mag when slide is open. Many manufacturers don't recommend this since the slide isn't back all the way and a possible hangup is a risk.. not so with Walther. The PPQ has no slide safety but a trigger (Glock style if you will) safety and 2 internal safeties. I carry this and it's banged around all the time and as long as its holstered its not going to just go off. The P99 AS has a flush mounted decocker in the slide and an anti-stress trigger so you can chamber a round, hit the decocker yet still have a safe heavier 9lb trigger pull followed by a lighter 4.5lb pull. I prefer the PPQ and its trigger myself but also looking at the smaller P99C AS for a few situations.
The PPQ is 100% ambidextrous and I've practiced using it with each hand to draw, rack, clear, reload and fire. Thankful now also since I've injured my right arm and looking at a long healing period. The P99 has the ambidextrous paddle but not the slide release though not a deal stopper at all.
The PPQ comes in 2 versions the Classic with the paddle or the M2 with the button and both come in 9 or 40. The Classic paddle PPQ is harder to come by but still available.
If you were closer I'd offer to meet up so you can check out mine but I think you're fairly far south.