A Victorian style greenhouse is a commonly built greenhouse. It is generally not as easy to build as a hoop greenhouse or grow rack greenhouse. This is because it has a gable or A-frame roof. This is a two-sided roof with each side being the same length and slope.
This style of greenhouse does have advantages when compared to other less complicated greenhouse designs. For one, it offers sufficient headroom for a person to walk around in without having to bend over. The structure also would make for a great place to hang-out during those cold days of late autumn.
Its frame can be constructed of wood, PVC or aluminum. Which material you use will be determined by cost. Using wood is aesthetically pleasing for some. However using PVC piping might be more cost-effective. If you are looking to build one with added strength you might consider using some sort of metal such as iron.
When covering the frame, there are a number of materials which could be used. The lightest choice would be some type of clear plastic sheeting. Glass could be used, but you would definitely want to make sure the frame you use can handle the weight. Fiber glass might be a better option. It is not as heavy as glass and would last longer than plastic sheeting.
Whatever materials you use to build your greenhouse, make sure it will give you a structure that will last. If the structure is temporary you may only have to consider how well it will hold up to any possible extreme weather events. In that case going with a structure which is not very strong, may not be very practical.