You can winter in a 3 season coach of any brand. Just expect to use lots of energy to keep warm. I own a Jayco TH and an Excel 4-season fiver. The difference between the two in even mild temps above freezing is huge. Bubble wrap on the windows and a large propane tank would help but it will be a battle in a Raptor.
As a former Raptor owner, I would rate their build quality as "average".
2014 Excel L34IKR, Hydralift Moto Carrier, 8K Axles
2007 Jayco Recon ZX F37U
2011 Ford F350 CC 6.7 DRW Lariat 4X4, AirSafe Hitch