Here are a couple photos of the Tikit with standard rear rack and 2 pannier front rack installed then covered with the shower cap. The shower cap still fits over the bike, but the rear rack is somewhat exposed since the back corners are rounded on the rack the shower cap won't stay in place over it.
The cap comes down almost to the ground over the front wheel, but due to the different shape of the 2 pannier front rack it is touching the front tire. If you rolled it like this you would wear through the shower cap in no time. I'll mention this to BF and suggest how the production 2 pannier front rack could be designed slightly differently to allow for an unhindered roll.
Once covered you can still lift the whole bike with the carry handle and move it around.